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Share-based Payments	3 Months Ended
Share-based Payments	Nov. 30, 2019
Share-based Payment Arrangement [Abstract]
Share-based Payments	Share-based Payments We account for share-based payments through the measurement and recognition of compensation expense for share-based payment awards made to employees and directors over the related requisite service period, including stock options, performance share units, and restricted shares (all part of our equity incentive plan), as well as share units representing certain deferrals into our director deferred compensation plan or our supplemental deferred savings plan. We recognized share-based payment expense of $16.7 million and $7.8 million during the three months ended November 30, 2019 and 2018, respectively. Further details regarding our stock options, restricted shares, and director compensation award programs and our share-based payments are included within the Share-based Payments footnote of the Notes to Consolidated Financial Statements within our Form 10-K. Equity Plan Updates During the current period, the Board of Directors (the “Board”) approved grants of performance share units to certain executives and key employees. These shares vest over a three-year period and are valued at the closing stock price on the date of grant. The actual number of performance shares earned will be determined at the end of the three-year period based on the level of achievement of established performance thresholds. We recognize compensation expense for these awards proportionately over the requisite service period for each employee when it becomes probable that the performance metric will be satisfied. As of November 30, 2019, we had approximately 37,000 performance share units outstanding. Additionally, effective for restricted stock and performance share grants awarded in October 2019 and thereafter, the Board reinstated a policy that provides for the continued vesting of stock awards following retirement for all eligible participants who have attained age 60 and have at least 10 years of service with the Company. As such, for awards granted in October 2019 and later, we deem the requisite service period for a participant to be the shorter of either the award's stated vesting period or the time from grant until the participant satisfies the age and service criteria.