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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
Aug. 31, 2017
Nov. 30, 2016
Fair Value, Inputs, Level 1    
Fair Value, Measurement Inputs, Disclosure [Line Items]    
Money market funds $ 180.5  
Fair Value, Inputs, Level 2    
Fair Value, Measurement Inputs, Disclosure [Line Items]    
Long-term debt excluding credit facilities, fair value 276.9 $ 278.2
Long-term debt excluding credit facilities, carrying amount $ 264.4 $ 265.0