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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Narrative (Details) (USD $)
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12 Months Ended |
36 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2015
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares granted, stock awards |
10,348,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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| Share-based compensation expense |
$ 11,583,000us-gaap_ShareBasedCompensation
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$ 13,459,000us-gaap_ShareBasedCompensation
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$ 15,139,000us-gaap_ShareBasedCompensation
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| Restricted stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized compensation cost |
12,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
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12,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
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| Weighted-average period for recognition |
1 year 6 months 20 days
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| Fair value of awards released |
7,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
|
6,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
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7,400,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
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| Stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Pricing model used in estimating grant-date fair value |
Black-Scholes
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| Unrecognized compensation cost |
100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Weighted-average period for recognition |
1 year
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| Total intrinsic value of options exercised |
400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Stock options | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Prices for stock options exercised |
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$ 0.11qtm_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodPricePerShare
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Stock options | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Prices for stock options exercised |
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$ 2.08qtm_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodPricePerShare
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Performance RSUs |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares granted, stock awards |
2,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= qtm_PerformanceRestrictedStockUnitsRsuMember
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200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= qtm_PerformanceRestrictedStockUnitsRsuMember
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| Fair value at the grant date |
3,000,000qtm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= qtm_PerformanceRestrictedStockUnitsRsuMember
|
200,000qtm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= qtm_PerformanceRestrictedStockUnitsRsuMember
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| Share-based compensation expense |
400,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= qtm_PerformanceRestrictedStockUnitsRsuMember
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| Market RSUs |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Pricing model used in estimating grant-date fair value |
Monte-Carlo
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Monte Carlo
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| Number of days over average stock price is calculated |
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60 days
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| Number of shares granted, stock awards |
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800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= qtm_MarketRestrictedStockUnitsRsuMember
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| Expected volatility rate |
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66.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= qtm_MarketRestrictedStockUnitsRsuMember
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| Risk free interest rate |
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0.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= qtm_MarketRestrictedStockUnitsRsuMember
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| Fair value at the grant date |
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$ 700,000qtm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= qtm_MarketRestrictedStockUnitsRsuMember
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| 2012 Long-Term Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total shares authorized |
34,300,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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34,300,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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| Shares available for grant |
12,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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12,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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| Stock options and restricted shares outstanding |
18,700,000qtm_OptionsAndRestrictedSharesOutstanding
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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18,700,000qtm_OptionsAndRestrictedSharesOutstanding
/ us-gaap_PlanNameAxis
= qtm_LongTermIncentivePlan2012Member
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| 2012 Long-Term Incentive Plan | Restricted Stock Units | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
3 years
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| 2012 Long-Term Incentive Plan | Restricted Stock Units | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
4 years
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| 2012 Long-Term Incentive Plan | Market RSUs | Vesting Date One |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected term |
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10 months
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| 2012 Long-Term Incentive Plan | Market RSUs | Vesting Date Two |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected term |
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22 months
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| 2012 Long-Term Incentive Plan | Market RSUs | Vesting Date Three |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected term |
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34 months
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| 2012 Long-Term Incentive Plan | Market RSUs | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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2 years
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| Other Stock Incentive Plans | Restricted stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
1 year
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| Other Stock Incentive Plans | Restricted stock | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
1 year
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| Other Stock Incentive Plans | Restricted stock | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
4 years
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| Other Stock Incentive Plans | Stock options | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
1 year
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| Stock options granted contractual terms |
7 years
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| Other Stock Incentive Plans | Stock options | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
4 years
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| Stock options granted contractual terms |
10 years
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| Stock purchase plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total shares authorized |
64,300,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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64,300,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Shares available for grant |
5,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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5,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Discount on market price to purchase stock |
15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Shares issued |
58,700,000us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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58,700,000us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Maximum amount of shares to be purchased in any offering period |
2,000,000qtm_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerOfferingPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Duration of offering periods |
6 months
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| Number of shares purchased |
2,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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3,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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| Weighted-average price of stock purchased |
$ 1.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
$ 1.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
$ 1.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
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$ 1.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
| Expected volatility rate |
36.58%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
43.71%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
69.73%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
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| Risk free interest rate |
0.07%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
0.07%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
0.13%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
|
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| Expected term |
6 months
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6 months
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6 months
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