Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Provisional transition tax		$ 59,114,000
Adjusted transition tax	$ 57,895,000	57,895,000
Expected future taxable income to realize deferred tax assets	118,447,000
Deferred tax assets OCL period increase (decrease)	(572,000)
Operating loss and tax credit carryforwards	843,000	974,000
US tax on deemed repatriated foreign earnings	6,348,000
Dividend from foreign subsidiary	(130,000,000)	(250,000,000)	$ (13,692,000)
Withholding tax	0
Undistributed earnings of foreign subsidiaries	388,535,000
Non US subsidiary cash and cash equivalents	214,876,000
Undistributed earnings from foreign subsidiaries not subject to transition tax	15,193,000
Income tax penalties and interest accrued	2,456,000	3,224,000
Income tax penalties and interest expense	(110,000)	369,000	$ 1,148,000
(Decrease) in unrecognized tax benefit expected to settle in next twelve months	3,272,000
State Tax Authority
Income Tax Contingency [Line Items]
Provisional transition tax		$ 1,976,000
Income Tax Expense (Benefit)
Income Tax Contingency [Line Items]
(Decrease) in unrecognized tax benefit expected to settle in next twelve months	2,332,000
Interest Expense
Income Tax Contingency [Line Items]
(Decrease) in unrecognized tax benefit expected to settle in next twelve months	$ 940,000