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Leases (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2020 | May 31, 2020 | Sep. 01, 2019 | Aug. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Short term lease |  | $ 0 |  |
Assets | $ 385,951,000 | 385,951,000 |  | $ 302,662,000
Liabilities | 240,968,000 | 240,968,000 |  | $ 157,187,000
Operating lease right-of-use assets | 7,769,000 | 7,769,000 |  |
Lease expense | 500,000 | 1,500,000 |  |
Lease payments | $ 500,000 | $ 1,500,000 |  |
Weighted-average lease term | 7 years 2 months 12 days | 7 years 2 months 12 days |  |
Weighted-average discount rate | 3.10% | 3.10% |  |
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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