Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets Narrative (Detail)

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Goodwill and Other Intangible Assets Narrative (Detail) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Future amortization expense, 2015 $ 25.6  
Future amortization expense, 2016 25.6  
Future amortization expense, 2017 24.9  
Future amortization expense, 2018 24.1  
Future amortization expense, 2019 23.9  
Future amortization expense, thereafter 115.2  
Goodwill, Impaired, Accumulated Impairment Loss   $ 22.2