Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current
Federal	$ 2,184	$ 11,971	$ 35,459
State	1,576	2,443	6,861
Foreign	8,039	12,039	7,069
Total	11,799	26,453	49,389
Deferred
Federal	(20,287)	7,887	8,234
State	(3,446)	1,113	624
Foreign	(762)	(833)	1,112
Total	(24,495)	8,167	9,970
Income taxes
Income tax (benefit) expense	(12,696)	34,620	59,359
Foreign income before taxes	49,319	105,938	95,850
Actual income taxes differed from that obtained by applying the statutory federal income tax rate to income before income taxes
Computed expected income taxes	(2,445)	54,910	77,399
State income taxes, net of federal income tax benefit	(1,403)	1,298	3,564
Foreign rate differential	(8,062)	(28,233)	(25,535)
Unrecognized tax benefits	2,691	3,670	3,566
Income tax expense on diminution of operations and nondeductible goodwill	3,921	1,352	0
Foreign income withholding tax expense	432	0	0
Non-taxable income	(5,055)	0	0
Statutory foreign income tax (benefit) expense	(2,504)	(477)	20
Other	(271)	2,100	345
Income tax (benefit) expense	$ (12,696)	$ 34,620	$ 59,359