Income Taxes - Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at April 1	$ 15,196	$ 16,675	$ 17,752
Increase for current year tax positions	482	275	24
Reduction for prior year tax positions	(7,296)	(1,764)	(223)
Impact of changes in exchange rates	(40)	10	(878)
Balance at March 31	8,342	15,196	16,675
Income tax penalties and interest accrued	791	255
Unrecognized tax benefits, interest on income taxes accrued	1,936	1,545
Income tax penalties accrued	1,218	818
Income tax penalties and interest expense related to settlements	148
Unrecognized tax benefits including interest and taxes	17,558	11,496
Reductions to unrecognized tax benefits resulting from lapse of applicable statute of limitations	258
Decrease for current year tax positions	5,804
Foreign income tax adjustment	22,972	$ 23,974	$ 26,476
Unrecognized tax benefits may decrease in the next twelve months	$ 271
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