Certain Financial Statement Information (Details 3) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012 Machinery and Equipment [Member] Minimum [Member]	Dec. 31, 2012 Machinery and Equipment [Member] Maximum [Member]	Dec. 31, 2012 Leasehold Improvements [Member] Minimum [Member]	Dec. 31, 2012 Leasehold Improvements [Member] Maximum [Member]	Dec. 31, 2012 Computers, Office Furniture and Equipment [Member] Minimum [Member]	Dec. 31, 2012 Computers, Office Furniture and Equipment [Member] Maximum [Member]	Dec. 31, 2012 Buildings [Member]
Schedule of Property and equipment
Useful life			5 years	7 years	1 year	15 years	3 years	7 years	31 years 6 months
Machinery and equipment	$ 37,357	$ 36,600
Leasehold improvements	16,634	14,228
Computers, office furniture and equipment	43,292	43,929
Buildings	2,756	2,756
Land	9,800	9,800
Property and equipment, gross	109,839	107,313
Less: accumulated depreciation and amortization	(73,668)	(69,213)
Property and equipment, net	$ 36,171	$ 38,100