Income Taxes - Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Change in net deferred income tax asset (liability)
Balance at the beginning of the period	$ 4,997
Deferred income taxes resulting from business combination	(5,452)
Deferred income taxes related to continuing operations	(614)
Deferred income taxes related to other comprehensive income	2
Foreign currency translation	333
Balance at March 31, 2018	(734)
Valuation Allowance for Deferred Tax Assets
Annual activities included in the deferred tax valuation allowance
Balance at the beginning of the period	163,898	$ 170,917	$ 167,594
Charge to costs and expenses	8,647	(2,094)	4,072
Deductions	(1,144)	(4,925)	(749)
Balance at the end of the period	$ 171,401	$ 163,898	$ 170,917