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Employee and Retiree Benefits - Schedule of Deferred Compensation Benefits (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
Aug. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]    
Non-qualified deferred compensation $ 12,672 $ 13,093
Supplemental executive retirement plan 2,085 2,072
Executive share option plan 0 12
Executive deferred compensation plan 715 621
Deferred compensation benefits 15,472 15,798
Less current portion 2,878 2,920
Deferred compensation benefits, net of current portion $ 12,594 $ 12,878