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Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Leases Disclosure [Line Items]      
Due in 2019 $ 29.4    
Due in 2020 20.6    
Due in 2021 15.3    
Due in 2022 13.1    
Due in 2023 10.8    
Due thereafter 35.0    
Operating lease, rental expense $ 34.9 $ 37.4 $ 37.6
Minimum      
Leases Disclosure [Line Items]      
Lease agreements period 1 year    
Maximum      
Leases Disclosure [Line Items]      
Lease agreements period 20 years