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Leases (Narrative) (Details)
3 Months Ended 6 Months Ended
Feb. 28, 2021
USD ($)
Feb. 29, 2020
USD ($)
Feb. 28, 2021
USD ($)
item
Feb. 29, 2020
USD ($)
Leases [Abstract]        
Short term lease     $ 0  
Additional right-of-use assets     1,100,000 $ 0
Lease expense $ 500,000 $ 500,000 1,000,000.0 1,000,000.0
Lease payments $ 600,000 $ 500,000 $ 1,100,000 $ 1,000,000.0
Weighted-average lease term 6 years 3 months 18 days   6 years 3 months 18 days  
Weighted-average discount rate 2.90%   2.90%  
Number of leases not yet commenced | item     0