Income Taxes - Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Annual activities included in the deferred tax valuation allowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 7,000	$ 3,300	$ 21,700
Expired foreign tax credits	$ 4,766	0	0
Deferred Tax Assets Period of Cumulative Loss for Determination of Full Valuation Allowance	3 years
Deferred income taxes	$ 5,577	5,577
Change in net deferred income tax asset (liability)
Balance at the beginning of the period	5,577
Deferred income taxes related to continuing operations	19
Deferred Income Taxes Related to Business Combination	0
Deferred income taxes related to other comprehensive income	181
Foreign currency translation	(554)
Balance at the end of the period	5,223	5,577
Valuation Allowance for Deferred Tax Assets
Annual activities included in the deferred tax valuation allowance
Balance at the beginning of the period	170,917	167,594	189,276
Charge to costs and expenses	(2,094)	4,072	(19,900)
Deductions	(4,925)	(749)	(1,782)
Balance at the end of the period	163,898	$ 170,917	$ 167,594
Domestic Tax Authority [Member]
Annual activities included in the deferred tax valuation allowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,200
Other Information Pertaining to Income Taxes	29.8