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

Annual report pursuant to Section 13 and 15(d)

DEBT - Narrative (Details)

DEBT - Narrative (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended	1 Months Ended
DEBT - Narrative (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Oct. 31, 2012	Nov. 06, 2012	Mar. 31, 2011	Mar. 29, 2012	Apr. 24, 2014	Jan. 28, 2015	Mar. 11, 2014	Nov. 15, 2010
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 1,295,000	$ 0	$ 0
Accrued interest paid	8,498,000us-gaap_InterestPaid	8,247,000us-gaap_InterestPaid	5,672,000us-gaap_InterestPaid
4.50% Convertible Subordinated Debt
Debt Instrument [Line Items]
Interest rate per annum on the principal amount (as a percent)				4.50%
Principal amount outstanding				60,000,000
Debt due date	Nov. 15, 2017
Additional aggregate principal amount of debt issued					10,000,000
Conversion rate				607.1645
Conversion ratio applied per principal amount				1,000
Conversion price (usd per share)	$ 1.65			$ 1.65
Latest date that investors may convert notes into common stock	Nov. 14, 2017
Capitalized debt issuance costs			2,300,000
3.50% Convertible Subordinated Debt
Debt Instrument [Line Items]
Interest rate per annum on the principal amount (as a percent)											3.50%
Principal amount outstanding											135,000,000
Debt due date	Nov. 15, 2015
Conversion price (usd per share)	$ 4.33										$ 4.33
Latest date that investors may convert notes into common stock	Nov. 14, 2015
Capitalized debt issuance costs						5,000,000
Repurchased principal amount									50,000,000	1,300,000
Repurchase amount									51,000,000	1,300,000
Loss on debt extinguishment	1,300,000
Loss from notes purchased	1,000,000
Write-off of unamortized debt issuance costs	300,000
Accrued interest paid	400,000
Wells Fargo Credit Agreement
Debt Instrument [Line Items]
Capitalized debt issuance costs							1,000,000
Fixed charge coverage ratio								1.5
Amount of liquidity to be below for covenant to be applicable	15,000,000							25,000,000
Line of credit facility, fixed charge coverage ratio								1.2
Line of credit facility, fixed charge coverage ratio, period when covenant is applied	12 months
Amount of borrowings, if exceeded, increase the filing compliance certificates to monthly rather than quarterly	5,000,000
Line of credit facility, amount of liquidity required to avoid audits								20,000,000
Amount of borrowings, if exceeded, increase the filing of compliance certificates to monthly rather than quarterly								5,000,000
Wells Fargo Credit Agreement \| Base rate \| Minimum
Debt Instrument [Line Items]
Interest rate margin								1.00%
Wells Fargo Credit Agreement \| Base rate \| Maximum
Debt Instrument [Line Items]
Interest rate margin								1.50%
Wells Fargo Credit Agreement \| LIBOR \| Minimum
Debt Instrument [Line Items]
Interest rate margin								2.00%
Wells Fargo Credit Agreement \| LIBOR \| Maximum
Debt Instrument [Line Items]
Interest rate margin								2.50%
Wells Fargo Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing amount								75,000,000
Line of credit facility, expiration date	Mar. 29, 2017
Line of credit facility, frequency of commitment fee payment	Quarterly
Line of credit facility, percent commitment fee on undrawn amounts	0.375%
Wells Fargo Credit Agreement \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, letters of credit outstanding	$ 1,000,000