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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ (6,203)	$ (4,087)	$ (986)	$ 1,349
Effective income tax rates	8.80%	6.80%	1.00%	(1.50%)
Excess tax benefit	$ 700	$ 1,100	$ 9,000	$ 11,000
Tax benefit from reversal of uncertain tax position	500	$ 700	1,400	$ 1,300
Unrecognized tax benefits	70,400		70,400		$ 69,100
Accrued interest and penalties related to uncertain tax positions	2,500		2,500		2,300
Expected decrease in uncertain tax positions	3,300		3,300
Non-current income tax payable
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 34,500		$ 34,500		$ 35,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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