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Operating Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Operating Leased Assets [Line Items]      
Total rent expense $ 1.5 $ 1.6 $ 1.8
Cost basis of office space available for lease 35.1    
Carrying value of office space available for lease 6.3    
Sublease revenue $ 3.9 $ 3.5 $ 3.6
Minimum [Member]      
Operating Leased Assets [Line Items]      
Operating lease term 1 year    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Operating lease term 6 years    
FC Organizational Products [Member]      
Operating Leased Assets [Line Items]      
Lease income $ 0.6