Quantum Corporation Quarterly report pursuant to Section 13 or 15(d)

RESTRUCTURING CHARGES (Schedule of Estimated Timing of Future Payouts) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	$ 6,197us-gaap_EffectOnFutureCashFlowsAmount
Next twelve months
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	3,136
January 2016 through February 2021
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	3,061
Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	525
Severance and Benefits \| Next twelve months
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	376
Severance and Benefits \| January 2016 through February 2021
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	149
Facilities
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	5,672
Facilities \| Next twelve months
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	2,760
Facilities \| January 2016 through February 2021
Restructuring Cost and Reserve [Line Items]
Estimated future payouts of severance and benefits	$ 2,912