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Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands | May 31, 2020 | Sep. 01, 2019 | Aug. 31, 2019 | May 31, 2019
--- | --- | --- | --- | ---
Basis Of Presentation [Line Items] |  |  |  |
Right of use asset | $ 27,663 |  | $ 0 | $ 0
Lease liability | $ 31,379 |  |  |
ASU 2016-02 [Member] |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Right of use asset |  | $ 26,200 |  |
Lease liability |  | $ 29,500 |  |

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