Accounts and Income Taxes Payable and Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)	Dec. 31, 2022	Mar. 31, 2022
Payables and Accruals [Abstract]
Payroll, payroll taxes and employee benefits	$ 36,477,000	$ 36,066,000
Customer deposits	82,857,000	69,781,000
Accrued professional service fees	8,596,000	8,073,000
Self-insurance accruals	3,032,000	2,798,000
Deferred revenue	26,340,000	25,796,000
Operating lease liabilities	10,687,000	13,348,000
Other	1,821,000	1,077,000
Total accrued liabilities	$ 169,810,000	$ 156,939,000