Property and Equipment - Property and Equipment, Net (Detail) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 308,886,000	$ 299,724,000
Less: accumulated depreciation and amortization	(222,994,000)	(216,954,000)
Property and equipment, net	85,892,000	82,770,000
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	213,145,000	202,095,000
Office Equipment And Computers [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	66,608,000	68,253,000
Land, Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,123,000	11,081,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 18,010,000	$ 18,295,000