Property and Equipment - Property and Equipment, Net (Detail) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 299,724,000	$ 284,193,000
Less: accumulated depreciation and amortization	(216,954,000)	(207,925,000)
Property and equipment, net	82,770,000	76,268,000
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	202,095,000	177,150,000
Office Equipment And Computers [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	68,253,000	77,380,000
Land, Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,081,000	11,081,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 18,295,000	$ 18,582,000