Restructuring and Related Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of the beginning and ending balances of the Company's restructuring liabilities
Balance at March 31, 2012	$ 6,299
Provision	1,125	2,346
Payments and settlements for restructuring	(3,707)	(344)
Balance at June 30, 2012	3,717
Severance and employment costs [Member] | Fiscal 2012 Restructuring Plan [Member]
Reconciliation of the beginning and ending balances of the Company's restructuring liabilities
Balance at March 31, 2012	5,507
Provision	1,161
Payments and settlements for restructuring	(3,541)
Balance at June 30, 2012	3,127
Facilities costs [Member] | Fiscal 2012 Restructuring Plan [Member]
Reconciliation of the beginning and ending balances of the Company's restructuring liabilities
Balance at March 31, 2012	297
Provision	(42)
Payments and settlements for restructuring	(100)
Balance at June 30, 2012	155
Facilities costs [Member] | Fiscal 2009 Restructuring Plan [Member]
Reconciliation of the beginning and ending balances of the Company's restructuring liabilities
Balance at March 31, 2012	495
Provision	6
Payments and settlements for restructuring	(66)
Balance at June 30, 2012	$ 435