Leases (Schedule of Lease Cost and Other Information Related to Company's Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Lease Cost [Abstract]
Operating lease cost (cost resulting from lease payments)	$ 5,441	$ 5,999
Variable lease cost (cost excluded from lease payments)	508	424
Total lease cost	5,949	6,423
Operating cash outflows from operating leases	$ 4,805	$ 5,767
Weighted average lease term - operating leases	9 years 8 months 12 days	9 years 1 month 6 days
Weighted average discount rate - operating leases	3.30%	3.20%