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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Deferred tax assets:    
Deferred revenue $ 25,252 $ 30,659
Employee compensation and benefits 75,689 76,327
Intangible assets, computer software and intellectual property 18,705 11,805
Tax credits, net capital and operating loss carryforwards 142,718 153,062
Lease liabilities 71,204  
Other 52,611 73,249
Total deferred tax assets 386,179 345,102
Valuation allowances (69,455) (85,533)
Total deferred tax assets, net 316,724 259,569
Deferred tax liabilities:    
Anticipated withholdings on subsidiaries' earnings (81,489) (70,961)
Intangible assets, computer software and intellectual property (114,772) (104,926)
Lease assets (69,215)  
Other (90,825) (81,736)
Total deferred tax liabilities (356,301) (257,623)
Net deferred tax (liabilities) assets $ (39,577) $ 1,946