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

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Share-based Compensation Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based compensation expense:
Total share-based compensation expense	$ 11,583	$ 13,459	$ 15,139
Cost of revenue
Share-based compensation expense:
Total share-based compensation expense	1,489	1,963	2,389
Research and development
Share-based compensation expense:
Total share-based compensation expense	2,559	3,430	3,665
Sales and marketing
Share-based compensation expense:
Total share-based compensation expense	3,506	4,097	4,699
General and administrative
Share-based compensation expense:
Total share-based compensation expense	$ 4,029	$ 3,969	$ 4,386