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Operating Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Operating Leased Assets [Line Items]      
Total rent expense $ 1.8 $ 2.2 $ 2.3
Cost basis of office space available for lease 34.1    
Carrying value of office space available for lease 7.9    
Sublease revenue $ 3.6 $ 4.4 $ 4.4
Minimum [Member]      
Operating Leased Assets [Line Items]      
Operating lease term 1 year    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Operating lease term 8 years    
FC Organizational Products [Member]      
Operating Leased Assets [Line Items]      
Lease income $ 0.7