Certain Financial Statement Information Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2014 Machinery and Equipment [Member] Minimum	Sep. 30, 2014 Machinery and Equipment [Member] Maximum	Sep. 30, 2014 Leasehold Improvements [Member] Minimum	Sep. 30, 2014 Leasehold Improvements [Member] Maximum	Sep. 30, 2014 Computers, Office Furniture and Equipment [Member] Minimum	Sep. 30, 2014 Computers, Office Furniture and Equipment [Member] Maximum
Schedule of Property and equipment
Useful life			3 years	5 years	1 year	5 years	3 years	5 years
Machinery and equipment	$ 46,032	$ 44,503
Leasehold improvements	12,911	11,574
Computers, office furniture and equipment	44,970	43,365
Property and equipment, gross	103,913	99,442
Less: accumulated depreciation and amortization	(83,130)	(78,696)
Property and equipment, net	$ 20,783	$ 20,746