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Income Taxes - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 22, 2017 | Dec. 21, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | May 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Corporate income tax rate |  | 21.00% | 35.00% | 21.00% | 35.00% |
Corporate tax rate reduction effective date | Jan. 01, 2018 |  |  |  |  |
Percentage of blended rate | 29.20% |  |  |  |  |
Provisional income tax expense (benefit) |  |  |  |  |  | $ 7,300,000
Provisional income tax expense (benefit) related to provisional re-measurement of deferred tax assets and liabilities |  |  |  | $ 0 |  | (15,700,000)
Provisional income tax benefit for the partial reversal of existing deferred tax liabilities |  |  |  |  |  | 44,900,000
Provisional charge for the transition tax on previously deferred foreign earnings |  |  |  |  |  | 67,900,000
Effective income tax expense rate |  |  |  | 23.70% | 24.70% |
Discrete benefits for excess tax benefits related to equity compensation |  |  |  | $ 3,600,000 | $ 1,500,000 |
Discrete tax expense (benefit) |  |  |  |  | $ (9,000,000) |
Deferred income tax liability |  |  |  | 19,900,000 |  | 19,900,000
Unremitted foreign earnings |  |  |  | 437,800,000 |  | $ 549,800,000
Provision for deferred income taxes |  |  |  | $ 0 |  |

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