Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	17 years		17 years
Operating lease costs	$ 2,011	$ 2,471	$ 7,610	$ 4,908
Variable lease costs	416	387	980	688
Cash paid for amounts included in the measurement of operating lease liabilities	$ 1,657	$ 1,338	$ 4,794	$ 3,889
Weighted average remaining lease term (in years)	14 years 8 months 12 days	15 years 4 months 24 days	14 years 8 months 12 days	15 years 4 months 24 days
Weighted average discount rate	3.20%	3.20%	3.20%	3.20%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	17 years		17 years