Leases - Summary of Components of Lease Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 4,249,000	$ 4,248,000	$ 7,958,000	$ 8,509,000
Finance lease expense	26,000	0	26,000	0
Short-term lease expense	25,000	46,000	165,000	51,000
Variable lease expense	64,000	38,000	118,000	43,000
Total lease expenses	$ 4,364,000	$ 4,332,000	$ 8,267,000	$ 8,603,000