Income Taxes Income Tax Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Contingency [Line Items]
U.S.	$ (24,749)	$ (91,290)	$ (44,731)
Non-U.S.	29,268	43,170	95,798
Income (loss) before income taxes and other items	4,519	(48,120)	51,067
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, Federal	0	0	(2,723)
Current, State	0	0	0
Current, Non-U.S.	20,374	22,877	5,999
Current income tax expense (benefit)	20,374	22,877	3,276
Deferred, Federal	0	0	3,466
Deferred, State	0	0	0
Deferred, Non-U.S.	2,565	16,065	21,250
Deferred, income tax expense (benefit)	2,565	16,065	24,716
Total	22,939	38,942	27,992
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax expense at U.S. statutory rate	1,582	(16,842)	17,873
Effect of non-U.S. income taxes	(2,754)	4,209	(1,921)
U.S. taxes on non-U.S. income	22,043	0	0
Change in valuation allowance	(20,701)	23,732	26,598
Increase (decrease) in reserves for uncertain tax positions	5,951	2,046	(11,781)
Exchange effects and currency translation	14,208	26,885	(1,482)
Permanent items	2,610	(1,088)	(1,295)
Total	$ 22,939	$ 38,942	$ 27,992