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Income Taxes (Additional Information) (Details 5) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Income Taxes [Line Items] |  |  |
Income tax benefit on income from subsidiaries | $ 38,600 | $ 50,500 | $ 74,700
Per basic share income tax benefit on income from subsidiaries | $ 0.22 | $ 0.27 | $ 0.39
Net change in the total valuation allowance | $ (59,300) | $ 40,000 |
Deferred tax liability | 86,202 | 88,445 |
Undistributed earnings of foreign subsidiaries | $ 3,400,000 |  |
Unrecognized deferred tax liability on these undistributed earnings description | Determination of the amount of unrecognized deferred tax liability on these undistributed earnings is not practicable. |  |
Possible adjustments for transfer pricing and certain inclusions in taxable income | $ 66,300 |  |
Accrued interest and penalties related to unrecognized tax benefits included in income tax provision | 27,100 | 21,900 |
Recognized (derecognized) tax benefit, accrued interest and penalties | 5,200 | $ 1,800 | $ 2,100
Fiscal Years 2012 through 2014 [Member] |  |  |
Income Taxes [Line Items] |  |  |
Potential additional income tax payment due | 5,300 |  |
Fiscal Years 2009 through 2011 [Member] |  |  |
Income Taxes [Line Items] |  |  |
Potential additional income tax payment due | 28,600 |  |
U.S. |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | 442,500 |  |
Tax credit carry forwards | 53,900 |  |
State and Local Jurisdiction |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | 58,700 |  |
Tax credit carry forwards | 5,000 |  |
Non U.S. |  |  |
Income Taxes [Line Items] |  |  |
Income tax benefit on reversal of valuation allowances | 27,500 |  |
Net operating loss carry forwards | 315,000 |  |
Investment tax credit [Member] | Non U.S. |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carry forwards | $ 21,400 |  |

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