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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