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Income Taxes (Additional Information) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 USD ($) | Aug. 31, 2018 USD ($) $ / shares | Aug. 31, 2017 USD ($) $ / shares | Aug. 31, 2016 USD ($) $ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Tax Cuts and Jobs Act, provisional income tax expense | $ 111,400 | $ 142,300 |  |
Tax Cuts and Jobs Act, one-time mandatory repatriation tax | 24,900 | 65,900 |  |
Tax Cuts and Jobs Act, re-measurement of deferred taxes |  | (10,500) |  |
Tax Cuts and Jobs Act, change in indefinite reinvestment assertion on certain earnings from foreign subsidiaries | 85,000 | $ 85,000 |  |
Net increase in effective tax rate |  | 0.298 |  |
Income Taxes [Line Items] |  |  |  |
Income tax benefit on income from subsidiaries |  | $ 52,100 | $ 38,600 | $ 50,500
Per basic share income tax benefit on income from subsidiaries (in dollars per share) | $ / shares |  | $ 0.30 | $ 0.22 | $ 0.27
Net change in the total valuation allowance |  | $ (62,100) | $ (59,300) |
Undistributed foreign earnings upon which taxes had not been provided | 85,000 | 85,000 |  |
Deferred tax liability on undistributed earnings of foreign subsidiaries | 74,654 | 74,654 | 86,202 |
Undistributed earnings of foreign subsidiaries | 2,400,000 | 2,400,000 |  |
Possible adjustments for transfer pricing and certain inclusions in taxable income | 106,100 | 106,100 |  |
Accrued interest and penalties related to unrecognized tax benefits included in income tax provision | 20,400 | 20,400 | 27,100 |
Recognized (derecognized) tax benefit, accrued interest and penalties |  | (6,700) | $ 5,200 | $ 1,800
Fiscal Years 2009 Through 2011 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Potential additional income tax payment due | 28,600 | 28,600 |  |
Fiscal Years 2012 Through 2014 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Potential additional income tax payment due | 5,300 | 5,300 |  |
U.S. |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carry forwards | 65,600 | 65,600 |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | 55,400 | 55,400 |  |
Tax credit carry forwards | 4,800 | 4,800 |  |
Non U.S. |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | 318,000 | 318,000 |  |
Non U.S. | Investment Tax Credit |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carry forwards | $ 23,300 | $ 23,300 |  |

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