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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Lessee, Lease, Description [Line Items]      
Lease expense associated with operating leases $ 1.6 $ 1.5 $ 1.5
Right-of-use operating lease assets obtained in exchange for operating lease liabilities 1.6    
Sublease revenue $ 4.0 $ 3.9 $ 3.9
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining operating lease term 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining operating lease term 4 years    
Corporate Campus [Member]      
Lessee, Lease, Description [Line Items]      
Cost basis $ 36.2    
Carrying value $ 4.6