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Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Leases [Abstract]    
Operating leases weighted average discount rate (percent) 2.20%  
Weighted average remaining lease term 6 years  
Rent expense   $ 5.5
Operating lease payments $ 4.5  
Right-of-Use asset obtained in exchange for operating lease liability $ 5.1