Income Taxes Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
U.S.	$ (55,073)	$ (24,749)	$ (91,290)
Non-U.S.	146,747	15,810	29,595
Income (loss) before income taxes and other items	91,674	(8,939)	(61,695)
Current
Federal	0	0	0
State	0	0	0
Non-U.S.	26,476	19,850	24,980
Current income tax expense (benefit)	26,476	19,850	24,980
Deferred
Federal	0	0	0
State	0	0	0
Non-U.S.	5,739	2,068	16,261
Deferred, income tax expense (benefit)	5,739	2,068	16,261
Total	32,215	21,918	41,241
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax expense at U.S. statutory rate	32,086	(3,129)	(21,594)
Effect of non-U.S. income taxes	(15,131)	647	7,377
U.S. taxes on non-U.S. income	23,734	14,768	(274)
Foreign tax credits expiration	47,552	0	0
Change in valuation allowance	(47,135)	(14,908)	25,080
Increase (decrease) in reserves for uncertain tax positions	(1,203)	5,227	3,971
Change in tax rates	2,480	0	0
Exchange effects and currency translation	15,492	14,308	26,884
Permanent items	891	5,005	(203)
Nontaxable gain - Zimbabwe subsidiary reconsolidation	(26,551)	0	0
Total	$ 32,215	$ 21,918	$ 41,241