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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Deferred tax assets:    
Deferred revenue $ 30,596 $ 44,571
Employee compensation and benefits 72,218 87,204
Intangible assets, computer software and intellectual property 9,793 14,997
Tax credits, net capital and operating loss carryforwards 184,450 155,478
Other 49,732 78,114
Total deferred tax assets 346,789 380,364
Valuation allowances (112,727) (94,573)
Total deferred tax assets, net 234,062 285,791
Deferred tax liabilities:    
Anticipated withholdings on subsidiaries' earnings (68,394) (74,419)
Intangible assets, computer software and intellectual property (114,094) (136,238)
Other (31,750) (32,736)
Total deferred tax liabilities (214,238) (243,393)
Net deferred tax assets $ 19,824 $ 42,398