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Leases (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Feb. 29, 2020	Feb. 29, 2020	Sep. 01, 2019	Aug. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Short term lease		$ 0
Assets	$ 333,331,000	333,331,000		$ 302,662,000
Liabilities	185,372,000	185,372,000		$ 157,187,000
Operating lease right-of-use assets	8,324,000	8,324,000
Lease expense	500,000	1,000,000.0
Lease payments	$ 500,000	$ 1,000,000.0
Weighted-average lease term	7 years 3 months 18 days	7 years 3 months 18 days
Weighted-average discount rate	3.20%	3.20%
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets			$ 9,000,000.0
Liabilities			$ 9,200,000
Operating lease right-of-use assets	$ 0	$ 0

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of operating lease expense. Excludes sublease income.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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