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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Deferred tax assets:    
Deferred revenue $ 20,813 $ 24,507
Employee compensation and benefits 114,122 113,431
Intangible assets and computer software 40,208 50,564
Tax credits, net capital and operating loss carryforwards 145,525 170,591
Lease liabilities 51,644 37,130
Other 79,822 76,908
Total deferred tax assets 452,134 473,131
Valuation allowances (63,213) (61,513)
Total deferred tax assets, net 388,921 411,618
Deferred tax liabilities:    
Anticipated withholdings on subsidiaries' earnings (15,802) (33,339)
Intangible assets and computer software (114,511) (116,966)
Lease assets (47,305) (33,215)
Other (55,016) (46,780)
Total deferred tax liabilities (232,634) (230,300)
Net deferred tax assets $ 156,287 $ 181,318