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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Deferred tax assets:    
Deferred revenue $ 44,571 $ 57,361
Employee compensation and benefits 87,204 80,312
Intangible assets, computer software and intellectual property 14,997 14,840
Tax credits, net capital and operating loss carryforwards 155,478 168,641
Other 78,114 68,073
Total deferred tax assets 380,364 389,227
Valuation allowances (94,573) (96,870)
Total deferred tax assets, net 285,791 292,357
Deferred tax liabilities:    
Anticipated withholdings on subsidiaries' earnings (74,419) (66,628)
Intangible assets, computer software and intellectual property (136,238) (146,848)
Other (32,736) (26,228)
Total deferred tax liabilities (243,393) (239,704)
Net deferred tax assets $ 42,398 $ 52,653