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Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 123 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2023 | Nov. 30, 2022 | Feb. 28, 2022 | Nov. 30, 2021 | Feb. 28, 2023 | Feb. 28, 2022 | Nov. 30, 2021 | Aug. 31, 2022 | Aug. 31, 2021
Equity [Abstract] |  |  |  |  |  |  |  |  |
Treasury Stock, Shares | 26,558,965 |  |  |  | 26,558,965 |  |  | 26,558,965 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 6,240,265 |  |  |  | 6,240,265 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 340,788 | $ 334,323 | $ 413,023 | $ 409,806 | $ 340,788 | $ 413,023 | $ 409,806 | $ 318,611 | $ 412,198
Net (loss) earnings | 4,497 | 7,453 | 1,221 | 2,788 | 11,950 | 4,009 |  |  |
Other Comprehensive (Loss) Income, Net of Tax | 1,243 | 6,024 | 1,744 | (10,044) | 7,267 | $ (8,300) |  |  |
Stock Issued During Period, Value, Employee Benefit Plan | 49 | 42 | 65 | 85 |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | 0 | 0 | 0 | 0 |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 2,120 | 2,155 | 2,142 | 6,147 |  |  |  |  |
Stock Value Issued to Acquired For and Distributed From Rabbi Trust | 61 | $ 77 | $ 25 | $ 25 |  |  |  |  |
Retained earnings | 978,701 |  |  |  | 978,701 |  |  | 966,751 |
Treasury Stock, Value | $ 742,844 |  |  |  | $ 742,844 |  |  | $ 742,844 |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  | $ 742,800 |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 10,000,000 |  |  |  | 10,000,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 83,732,000 | 83,529,000 | 83,345,000 | 83,092,000 | 83,732,000 | 83,345,000 | 83,092,000 | 83,397,000 | 83,022,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 16,746 | $ 16,706 | $ 16,669 | $ 16,622 | $ 16,746 | $ 16,669 | $ 16,622 | $ 16,679 | $ 16,604
Stock Issued During Period, Shares, Employee Benefit Plan | 2,000 | 3,000 | 5,000 | 2,000 |  |  |  |  |
Stock Issued During Period, Value, Employee Benefit Plan |  | $ 1 | $ 1 | $ 1 |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 173,000 | 84,000 | 247,000 | 67,000 |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 34 | $ 17 | $ 46 | $ 17 |  |  |  |  |
Stock Issued To Acquired For And Distributed From Rabbi Trust | 28,000 | 3,000 | 1,000 | 1,000 |  |  |  |  |
Stock Value Issued to Acquired For and Distributed From Rabbi Trust | $ 6 | $ 1 |  | $ 0 |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 215,879 | 215,194 | $ 208,022 | 207,817 | 215,879 | 208,022 | 207,817 | 212,986 | 202,971
Stock Issued During Period, Value, Employee Benefit Plan | 49 | 41 | 64 | 84 |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | (34) | (17) | (46) | (17) |  |  |  |  |
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 2,120 | 2,155 | 2,142 | 6,147 |  |  |  |  |
Stock Value Issued to Acquired For and Distributed From Rabbi Trust | 55 | 76 | 25 | 25 |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (742,844) | (742,844) | (667,732) | (667,732) | (742,844) | (667,732) | (667,732) | (742,844) | (667,732)
Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 978,701 | 974,204 | 957,348 | 956,127 | 978,701 | 957,348 | 956,127 | 966,751 | 953,339
Net (loss) earnings | 4,497 | 7,453 | 1,221 | 2,788 |  |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (127,694) | (128,937) | (101,284) | (103,028) | (127,694) | (101,284) | (103,028) | (134,961) | (92,984)
Other Comprehensive (Loss) Income, Net of Tax | 1,243 | 6,024 | 1,744 | (10,044) |  |  |  |  |
Stock held in trust [member] [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (3,320) | (3,239) | (3,089) | (3,092) | (3,320) | (3,089) | (3,092) | (3,209) | (3,067)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust | (81) | (30) | 3 | (25) |  |  |  |  |
Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3,320 | 3,239 | 3,089 | 3,092 | $ 3,320 | $ 3,089 | $ 3,092 | $ 3,209 | $ 3,067
Stock Value Issued to Acquired For and Distributed From Rabbi Trust | $ 81 | $ 30 | $ (3) | $ 25 |  |  |  |  |

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