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Employee and Retiree Benefits - Schedule of Deferred Compensation Benefits (Details) - USD ($) $ in Thousands | Feb. 29, 2020 | Aug. 31, 2019
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Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |
Non-qualified deferred compensation | $ 12,259 | $ 13,093
Supplemental executive retirement plan | 2,098 | 2,072
Executive share option plan | 0 | 12
Executive deferred compensation plan | 665 | 621
Deferred compensation benefits | 15,022 | 15,798
Less current portion | 2,856 | 2,920
Deferred compensation benefits, net of current portion | $ 12,166 | $ 12,878

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