Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Income Tax Disclosure [Abstract]
Foreign withholding taxes	$ 14,192	$ 16,692
Undistributed earnings	46,010	34,015
Goodwill	30,851	31,515
All other	20,998	22,386
Total deferred tax liabilities	112,051	104,608
Employee benefit plans	69,373	50,761
Reserves and accruals	45,793	51,841
Deferred income	8,098	9,035
Deferred compensation	3,035	5,055
All other	17,144	9,927
Total deferred tax assets	143,443	126,619
Valuation allowance	(4,620)	(3,427)
Net deferred tax assets	$ 138,823	$ 123,192