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CONVERTIBLE SUBORDINATED DEBT AND LONG-TERM DEBT (Narrative) (Details) (USD $)
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12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 29, 2012
Wells Fargo Credit Agreement [Member]
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Apr. 24, 2014
Wells Fargo Credit Agreement [Member]
Rate
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Mar. 31, 2014
Wells Fargo Credit Agreement [Member]
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Apr. 24, 2014
Wells Fargo Credit Agreement [Member]
Base Rate [Member]
Minimum [Member]
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Apr. 24, 2014
Wells Fargo Credit Agreement [Member]
Base Rate [Member]
Maximum [Member]
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Apr. 24, 2014
Wells Fargo Credit Agreement [Member]
LIBOR [Member]
Minimum [Member]
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Apr. 24, 2014
Wells Fargo Credit Agreement [Member]
LIBOR [Member]
Maximum [Member]
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Mar. 31, 2012
Credit Suisse Credit Agreement [Member]
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Jul. 12, 2007
Credit Suisse Credit Agreement [Member]
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Mar. 31, 2014
Revolving Credit Facility [Member]
Wells Fargo Credit Agreement [Member]
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Apr. 24, 2014
Revolving Credit Facility [Member]
Wells Fargo Credit Agreement [Member]
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Jul. 12, 2007
Revolving Credit Facility [Member]
Credit Suisse Credit Agreement [Member]
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Mar. 31, 2014
Letter Of Credit [Member]
Wells Fargo Credit Agreement [Member]
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Oct. 31, 2012
4.50% Convertible Subordinated Debt [Member]
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Nov. 06, 2012
4.50% Convertible Subordinated Debt [Member]
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Mar. 11, 2014
3.50% Convertible Subordinated Debt [Member]
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Nov. 15, 2010
3.50% Convertible Subordinated Debt [Member]
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Jul. 12, 2007
Senior Secured Term Loan [Member]
Credit Suisse Credit Agreement [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||
| Principal amount outstanding | $ 60,000,000 | $ 135,000,000 | $ 400,000,000 | ||||||||||||||||||
| Debt due date | Nov. 15, 2017 | Nov. 15, 2017 | Nov. 15, 2015 | ||||||||||||||||||
| Additional aggregate principal amount of debt issued | 10,000,000 | ||||||||||||||||||||
| Conversion rate | 607.1645 | ||||||||||||||||||||
| Conversion price | $ 1.65 | $ 4.33 | |||||||||||||||||||
| Latest date that investors may convert notes into Quantum common stock | Nov. 14, 2017 | Nov. 14, 2015 | |||||||||||||||||||
| Interest per annum on the principal amount | 4.50% | 3.50% | |||||||||||||||||||
| Fees related to debt | 1,000,000 | 8,100,000 | 2,300,000 | 5,000,000 | |||||||||||||||||
| Principal amount of principal purchased in private transaction with note holder | 1,265,000 | 1,300,000 | |||||||||||||||||||
| Line of Credit Facility, maximum borrowing amount | 75,000,000 | 50,000,000 | |||||||||||||||||||
| Line of Credit Facility, credit agreement maturity date | Mar. 29, 2017 | ||||||||||||||||||||
| Line of Credit Facility, frequency of commitment fee payment | Quarterly | ||||||||||||||||||||
| Line of Credit Facility, percent commitment fee on undrawn amounts | 0.375% | ||||||||||||||||||||
| Interest rate margin | 1.00% | 1.50% | 2.00% | 2.50% | |||||||||||||||||
| Line of Credit Facility, maximum amount available to borrow | 74,000,000 | 54,000,000 | |||||||||||||||||||
| Line of Credit Facility, letters of credit outstanding | 1,000,000 | ||||||||||||||||||||
| Line of Credit Facility, amount of liquidity to be below for covenant to be applicable | 25,000,000 | ||||||||||||||||||||
| Line of Credit Facility, Fixed Charge Coverage Ratio, ratio to apply repayment covenant | 1.5 | ||||||||||||||||||||
| Line of Credit Facility, Fixed Charge Coverage Ratio, ratio when covenant is applicable | 1.2 | ||||||||||||||||||||
| Line of Credit Facility, amount of liquidity required to avoid audits | 20,000,000 | ||||||||||||||||||||
| Amount of borrowings, if exceeded, increase the filing of compliance certificates to monthly rather than quarterly | 5,000,000 | ||||||||||||||||||||
| Amount of unamortized debt costs written off | $ 2,300,000 | ||||||||||||||||||||