Subsequent Events (Details) $ in Thousands		12 Months Ended
	May 27, 2020 USD ($) item	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	May 26, 2020
Subsequent Events
Amount drawn down on credit facility		$ 145,000	$ 74,500	$ 75,000
Credit Agreement Amendment
Subsequent Events
Amount prepaid	$ 55,000
Third Credit Agreement Amendement
Subsequent Events
Total amount outstanding under the credit facility	$ 444,969
London Interbank Offered Rate L I B O R | Third Credit Agreement Amendement
Subsequent Events
Interest rate (as a percent)	3.50%
Delayed-draw term loan | Third Credit Agreement Amendement
Subsequent Events
Amount under term loan	$ 62,492
Term of credit facility	364 days
Minimum | London Interbank Offered Rate L I B O R | Third Credit Agreement Amendement
Subsequent Events
LIBOR floor interest rate	1.00%				0.00%
Maximum | Delayed-draw term loan | Third Credit Agreement Amendement
Subsequent Events
Number of draw downs before September 24,2020 | item	3
Debt Instrument, From December 31, 2019 And Not More Than Period Ending Prior To September 30, 2020
Subsequent Events
Maximum leverage ratio for next nine months		3.25