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Leases (Narrative) (Details)	3 Months Ended		9 Months Ended
	May 31, 2021 USD ($)	May 31, 2020 USD ($)	May 31, 2021 USD ($) item	May 31, 2020 USD ($)
Leases [Abstract]
Short term lease			$ 0
Additional right-of-use assets			1,900,000	$ 0
Lease expense	$ 500,000	$ 500,000	1,500,000	1,500,000
Lease payments	$ 500,000	$ 500,000	$ 1,600,000	$ 1,500,000
Weighted-average lease term	6 years 10 months 24 days		6 years 10 months 24 days
Weighted-average discount rate	2.90%		2.90%
Number of leases not yet commenced | item			0

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Amount of operating lease expense. Excludes sublease income.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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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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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Lessee, Operating Lease, Number Of Lease Not yet Commenced

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