Accounts and Taxes Payable and Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)	Jun. 30, 2018	Mar. 31, 2018
Payables And Accruals [Abstract]
Payroll, payroll taxes and employee benefits	$ 18,742,000	$ 15,100,000
Customer deposits	35,695,000	35,496,000
Accrued professional service fees	5,435,000	5,782,000
Self-insurance accruals	3,412,000	3,627,000
Deferred revenue	16,482,000	15,316,000
Accrued rent	5,956,000	6,147,000
Other	3,088,000	3,068,000
Total accrued liabilities	$ 88,810,000	$ 84,536,000