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Significant Accounting Policies - Assets Held For Sale (Details) - Held-for-sale $ in Millions | 12 Months Ended
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Aug. 31, 2021 USD ($) building | Aug. 31, 2020 USD ($) building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of buildings classified as held for sale | building | 1 | 3
Assets held for sale, total | $ | $ 6.6 | $ 4.1

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