Property and Equipment - Property and Equipment, Net (Detail) - USD ($) |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 381,314,000 | $ 333,542,000 |
| Less: accumulated depreciation and amortization | (263,408,000) | (241,490,000) |
| Property and equipment, net | 117,906,000 | 92,052,000 |
| Computer Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 270,404,000 | 234,459,000 |
| Office Equipment And Computers [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 76,788,000 | 65,429,000 |
| Land, Building And Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 11,047,000 | 11,047,000 |
| Leasehold Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 23,075,000 | $ 22,607,000 |