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Leases (Narrative) (Details)	12 Months Ended
	Aug. 31, 2020 USD ($) item	Sep. 01, 2019 USD ($)	Aug. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Short term lease	$ 0
Operating lease right-of-use assets	8,168,000
Lease expense	2,000,000.0
Lease payments	$ 1,900,000
Weighted-average lease term	6 years 9 months 18 days
Weighted-average discount rate	3.10%
Number of leases not yet commenced | item	0
Assets	$ 362,637,000		$ 302,662,000
Liabilities	202,324,000		$ 157,187,000
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 0
Accounting Standards Update 2018-11 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		$ 9,000,000.0
Liabilities		$ 9,200,000

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