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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Lessee, Lease, Description [Line Items]      
Lease expense associated with operating leases $ 1.2 $ 1.5 $ 1.6
Right-of-use operating lease assets obtained in exchange for operating lease liabilities 0.6    
Sublease revenue $ 2.4 $ 3.9 $ 4.0
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining operating lease term 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining operating lease term 5 years    
Corporate Campus [Member]      
Lessee, Lease, Description [Line Items]      
Cost basis $ 37.1    
Carrying value $ 3.0