Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Components of Income (loss) before income taxes
Domestic (U.S.)	$ 141,632	$ 653	$ (38,581)
Foreign (Outside U.S.)	45,886	9,983	7,364
Income (loss) before income taxes and equity income (loss) from equity method investments	187,518	10,636	(31,217)
Current:
Federal	223	0	0
State and local	50	62	95
Foreign	8,295	4,247	5,416
Total current income tax expense from continuing operations	8,568	4,309	5,511
Deferred:
Federal	(807)	(6)	(647)
State and local	(96)	(97)	172
Foreign	1,516	84	970
Deferred tax expense (benefit) from continuing operations	613	(19)	495
Provision for income taxes	9,181	4,290	6,006
Latest Tax Year
Deferred:
Foreign	$ 600	$ 1,200	$ 1,400