Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at April 1	$ 16,675	$ 17,752	$ 12,635
Increase for current year tax positions	275	24	7,260
Reduction for prior year tax positions	(1,764)	(223)	(1,055)
Impact of changes in exchange rates	10	(878)	(1,088)
Balance at March 31	15,196	16,675	17,752
Unrecognized tax benefits, income tax penalties and interest accrued	255	(224)
Unrecognized tax benefits, interest on income taxes accrued	1,545	1,315
Unrecognized tax benefits, income tax penalties accrued	818	793
Unrecognized tax benefits, income tax penalties and interest expense, related to settlements	287
Unrecognized tax benefits including interest and taxes	17,558	18,784
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations	505
Decrease for current year tax positions	721
Foreign income tax adjustment	23,974	$ 26,476	$ 19,850
Unrecognized tax benefits may decrease in the next twelve months	$ 261
Foreign Tax Authority | Minimum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Income Tax Examination, Open Tax Years	3 years
Foreign Tax Authority | Maximum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Income Tax Examination, Open Tax Years	6 years
State and Local Jurisdiction | Minimum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Income Tax Examination, Open Tax Years	3 years
State and Local Jurisdiction | Maximum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Income Tax Examination, Open Tax Years	6 years
Zimbabwe High Court of Harare
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Foreign income tax adjustment	$ 9,000