Accounts and Income Taxes Payable and Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Payables and Accruals [Abstract]
Payroll, payroll taxes and employee benefits	$ 26,291,000	$ 22,170,000
Customer deposits	88,142,000	80,022,000
Accrued professional service fees	9,838,000	8,601,000
Self-insurance accruals	3,818,000	3,563,000
Deferred revenue	29,961,000	26,978,000
Operating lease liabilities	8,864,000	9,900,000
Other	954,000	1,344,000
Total accrued liabilities	$ 167,868,000	$ 152,578,000