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INCOME TAXES - Narrative (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Mar. 31, 2015
Rate
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Mar. 31, 2014
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Mar. 31, 2013
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| Income Tax Disclosure [Abstract] | |||
| Federal statutory rate (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | ||
| Increase (decrease) in valuation allowance | $ (8.9)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ (8.0)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 17.0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
| Total unrecognized tax benefit including interest and penalties | 33.5us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | ||
| Accrued interest and penalties | 1.1us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | ||
| Federal net operating loss | 259.3us-gaap_OperatingLossCarryforwards | ||
| Tax credit carryforwards | 140.0us-gaap_TaxCreditCarryforwardAmount | ||
| Federal net operating loss carryforwards attributable to excess tax deductions from stock option exercises | 33.6qtm_OperatingLossCarryForwardsAttributableToExcessTaxDeductions | ||
| Acquired net operating losses included in carryforwards | 11.1qtm_OperatingLossCarryForwardsAcquired | ||
| Acquired credits included in carryforwards | $ 10.7qtm_TaxCreditCarryForwardAcquiredAmount | ||
| X | ||||||||||
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- Definition
Operating Loss Carryforwards Acquired. No definition available.
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| X | ||||||||||
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- Definition
Operating Loss Carry Forwards Attributable To Excess Tax Deductions. No definition available.
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| X | ||||||||||
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- Definition
Tax credit carryforward acquired amount. No definition available.
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| X | ||||||||||
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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