Quantum Corporation Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING CHARGES - Schedule of Estimated Timing of Future Payouts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	$ 4,846us-gaap_EffectOnFutureCashFlowsAmount
Fiscal 2016
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	3,855
Fiscal 2017 to 2021
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	991
Severance and benefits
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	189
Severance and benefits \| Fiscal 2016
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	75
Severance and benefits \| Fiscal 2017 to 2021
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	114
Facilities
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	4,657
Facilities \| Fiscal 2016
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	3,780
Facilities \| Fiscal 2017 to 2021
Restructuring Cost and Reserve [Line Items]
Estimated timing of future payouts	$ 877