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

FAIR VALUE - Schedule of Carrying Value and Fair Value of Financial Liabilities (Details)

FAIR VALUE - Schedule of Carrying Value and Fair Value of Financial Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Carrying Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	$ 70,631	$ 65,028
Level 2 fair value measurements \| Fair Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	73,522	68,516
Convertible subordinated debt \| Carrying Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	57,034	62,827
Convertible subordinated debt \| Level 2 fair value measurements \| Fair Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	56,805	60,667
Revolving credit agreement \| Carrying Value \| Revolving credit agreement \| Revolving credit agreement
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	22,144	16,852
Revolving credit agreement \| Level 2 fair value measurements \| Fair Value \| Revolving credit agreement \| Revolving credit agreement
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	23,518	18,490
Term loan agreement \| Carrying Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	48,487	48,176
Term loan agreement \| Level 2 fair value measurements \| Fair Value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Total long-term debt	$ 50,004	$ 50,026