Line of Credit - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Mar. 12, 2021	Mar. 29, 2018
Line Of Credit Facility [Line Items]
Loans outstanding	$ 0		$ 0		$ 0
Remaining borrowing capacity	300,000,000		300,000,000		$ 300,000,000
Interest expense	193,000	$ 928,000	383,000	$ 1,856,000
Amortization of debt issuance costs	127,000	$ 178,000	254,000	$ 355,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150,000,000		$ 150,000,000			$ 300,000,000	$ 300,000,000
Credit agreement maturity date			Mar. 12, 2026
Letter of Credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity						10,000,000
Swing-Line Loans
Line Of Credit Facility [Line Items]
Maximum borrowing capacity						$ 10,000,000