Income Taxes Accounting for Uncertainty in Income Taxes (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at	$ 11,804,000	$ 9,019,000	$ 9,004,000
Increase for current year tax positions	1,661,000	58,000	3,500,000
Increases (reductions) for prior year tax positions	(1,960,000)	3,030,000	5,539,000
Impact of changes in exchange rates	(131,000)	(303,000)	(63,000)
Reductions for settlements	(3,500,000)	0	(8,961,000)
Balance at	7,874,000	11,804,000	9,019,000
Unrecognized tax benefits, income tax penalties and interest accrued	(7,851)	1,176
Unrecognized tax benefits, interest on income taxes accrued	822,000	8,690,000
Unrecognized tax benefits, income tax penalties accrued	1,207,000	1,190,000
Unrecognized tax benefits, income tax penalties and interest expense, related to settlements		5,038,000
Unrecognized tax benefits including interest and taxes	9,902,000	21,683,000
Increases due to adoption of new positions	2,315
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations	6,411,000
Increase for current year tax positions	$ 4,184,000
State Jurisdiction [Member] | Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	3 years
State Jurisdiction [Member] | Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	6 years
U.S. [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards, expiration dates (in years)	P5Y
Non-U.S [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards, expiration dates (in years)	P5Y
Non-U.S [Member] | Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	3 years
Non-U.S [Member] | Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax examination, open tax years	6 years