Leases (Schedule of Lease Cost and Other Information Related to Company's Operating Leases) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	May 31, 2020 USD ($)	May 31, 2020 USD ($)
Lease Cost [Abstract]
Operating lease cost (cost resulting from lease payments)	$ 1,502	$ 4,412
Variable lease cost (cost excluded from lease payments)	112	312
Total lease cost	1,614	4,724
Operating cash outflows from operating leases	$ 1,178	$ 3,997
Weighted average lease term - operating leases	9 years 2 months 12 days	9 years 2 months 12 days
Weighted average discount rate - operating leases	3.20%	3.20%