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Income Taxes (Reconciliation of Income Tax Expense) (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Income Taxes [Abstract]      
Tax at U.S. federal statutory income tax rate (35%) $ 89,682 $ 135,470 $ 151,076
State income taxes, net of federal tax benefit (8,474) (5,121) (4,474)
Impact of foreign tax rates (109,466) (144,521) (157,827)
Permanent impact of non-deductible cost 7,336 3,408 8,951
Income tax credits (16,254) (5,040) (12,773)
Changes in tax rates on deferred tax assets and liabilities 688 182 (1,206)
Valuation allowance 37,934 11,770 72,604
Non-deductible equity compensation 11,531 18,350 11,600
Impact of intercompany charges and dividends 98,052 94,596 49,843
Other, net 18,037 23,055 19,667
Total income tax expense $ 129,066 $ 132,149 $ 137,461