Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 6,299	$ 733	$ 1,938
Provision	1,088	11,462	405
Payments and settlements for restructuring	(6,803)	(5,896)	(1,610)
Ending Balance	584	6,299	733
Fiscal 2012 Restructuring Plan [Member] | Severance and employment costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	5,507	0
Provision	1,149	7,688
Payments and settlements for restructuring	(6,306)	(2,181)
Ending Balance	350	5,507
Fiscal 2012 Restructuring Plan [Member] | Facilities costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	297	0
Provision	(57)	3,231
Payments and settlements for restructuring	(240)	(2,934)
Ending Balance	0	297
Fiscal 2009 Restructuring Plan [Member] | Severance and employment costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		289	1,289
Provision		308	(35)
Payments and settlements for restructuring		(597)	(965)
Ending Balance		0	289
Fiscal 2009 Restructuring Plan [Member] | Facilities costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	495	444	649
Provision	(4)	235	57
Payments and settlements for restructuring	(257)	(184)	(262)
Ending Balance	234	495	444
Fiscal 2009 Restructuring Plan [Member] | SERP [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Provision			383
Payments and settlements for restructuring			(383)
Ending Balance			$ 0