Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

v2.4.0.8
Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Leases Disclosure [Line Items]      
Due in 2014 $ 24.1    
Due in 2015 19.1    
Due in 2016 15.9    
Due in 2017 13.3    
Due in 2018 10.3    
Due thereafter 38.6    
Operating lease, rental expense $ 26.0 $ 24.2 $ 21.1
Minimum
     
Leases Disclosure [Line Items]      
Lease agreements period 1 year    
Maximum
     
Leases Disclosure [Line Items]      
Lease agreements period 20 years