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Fair Value Measurement - Additional Information (Details) - USD ($)
$ in Millions
Nov. 30, 2017
Aug. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure $ 0.1  
Foreign Currency Contracts, Liability, Fair Value Disclosure   $ 0.2
Senior Notes | 5.625% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long-term debt $ 295.1 $ 295.8