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

RESTRUCTURING CHARGES - Fiscal 2017 April Restructuring Plan (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2016 position	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 15	$ 387	$ 2,067	$ 645
Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ (39)	$ 155	1,450	$ 227
Fiscal 2017 April Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Positions eliminated (positions) \| position	29
Fiscal 2017 April Restructuring Plan \| Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs				$ 1,500