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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Type of Adoption [Domain] | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Retained Earnings Type of Adoption [Domain] | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Type of Adoption [Domain] | Stock Held in Trust | Deferred Compensation Liability
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Shares, Issued at Aug. 31, 2018 |  |  | 81,424 |  |  |  |  |  |  |  |
Beginning Balance at Aug. 31, 2018 | $ 558,712 |  | $ 16,285 | $ 167,448 | $ (617,731) | $ 1,166,955 |  | $ (174,245) |  | $ (2,450) | $ 2,450
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) | (249,145) |  |  |  |  | (249,145) |  |  |  |  |
Total other comprehensive income (loss), net of tax | 2,573 |  |  |  |  |  |  | 2,573 |  |  |
Company stock contribution to employee benefit plans and other (in shares) |  |  | 20 |  |  |  |  |  |  |  |
Company stock contribution to employee benefit plans and other | 496 |  | $ 4 | 492 |  |  |  |  |  |  |
Restricted stock awards, vesting and withhold to cover (in shares) |  |  | 375 |  |  |  |  |  |  |  |
Restricted stock awards issuance and vesting | 0 |  | $ 75 | (75) |  |  |  |  |  |  |
Cash dividend ($0.04 per share) | (2,419) |  |  |  |  | (2,419) |  |  |  |  |
Treasury stock repurchases | (22,481) |  |  |  | 22,481 |  |  |  |  |  |
Stock based compensation expense | 13,318 |  |  | 13,318 |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  | 65 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 1,404 |  | $ 13 | 1,391 |  |  |  |  |  |  |
Excess tax benefit (shortfall) on stock option exercises | (1,872) |  |  | (1,872) |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust (in shares) |  |  | 35 |  |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust | 518 |  | $ 7 | 511 |  |  |  |  |  | (620) | 620
Shares, Issued at Aug. 31, 2019 |  |  | 81,919 |  |  |  |  |  |  |  |
Ending Balance at Aug. 31, 2019 | 301,179 |  | $ 16,384 | 181,213 | (640,212) | 915,466 |  | (171,672) |  | (3,070) | 3,070
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ 75 |  |  |  |  | $ 75 |  |  |  |
Net earnings (loss) | 723 |  |  |  |  | 723 |  |  |  |  |
Total other comprehensive income (loss), net of tax | 74,615 |  |  |  |  |  |  | 74,615 |  |  |
Company stock contribution to employee benefit plans and other (in shares) |  |  | 23 |  |  |  |  |  |  |  |
Company stock contribution to employee benefit plans and other | 461 |  | $ 5 | 456 |  |  |  |  |  |  |
Restricted stock awards, vesting and withhold to cover (in shares) |  |  | 484 |  |  |  |  |  |  |  |
Restricted stock awards issuance and vesting | 0 |  | $ 96 | (96) |  |  |  |  |  |  |
Cash dividend ($0.04 per share) | (2,391) |  |  |  |  | (2,391) |  |  |  |  |
Treasury stock repurchases | (27,520) |  |  |  | 27,520 |  |  |  |  |  |
Stock based compensation expense | 13,309 |  |  | 13,309 |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  | 145 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | 2,631 |  | $ 29 | 2,602 |  |  |  |  |  |  |
Excess tax benefit (shortfall) on stock option exercises | (4,286) |  |  | (4,286) |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust (in shares) |  |  | 23 |  |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust | 299 |  | $ 5 | 294 |  |  |  |  |  | 508 | (508)
Shares, Issued at Aug. 31, 2020 |  |  | 82,594 |  |  |  |  |  |  |  |
Ending Balance at Aug. 31, 2020 | 359,226 |  | $ 16,519 | 193,492 | (667,732) | 917,671 |  | (100,724) |  | (2,562) | 2,562
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 917,671 | $ 206 |  |  |  |  | $ 3,873 |  | $ (3,667) |  |
Net earnings (loss) | 38,077 |  |  |  |  | 38,077 |  |  |  |  |
Total other comprehensive income (loss), net of tax | 7,740 |  |  |  |  |  |  | 7,740 |  |  |
Company stock contribution to employee benefit plans and other (in shares) |  |  | 17 |  |  |  |  |  |  |  |
Company stock contribution to employee benefit plans and other | 363 |  | $ 4 | 359 |  |  |  |  |  |  |
Restricted stock awards, vesting and withhold to cover (in shares) |  |  | 282 |  |  |  |  |  |  |  |
Restricted stock awards issuance and vesting | 0 |  | $ 56 | (56) |  |  |  |  |  |  |
Cash dividend ($0.04 per share) | (2,409) |  |  |  |  | (2,409) |  |  |  |  |
Treasury stock repurchases | 0 |  |  |  | 0 |  |  |  |  |  |
Stock based compensation expense | 9,215 |  |  | 9,215 |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  | 104 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  | $ 20 | 2,188 |  |  |  |  |  |  |
Excess tax benefit (shortfall) on stock option exercises | (2,445) |  |  | (2,445) |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust (in shares) |  |  | 25 |  |  |  |  |  |  |  |
Stock issued to, acquired for and distributed from rabbi trust | 223 |  | $ 5 | 218 |  |  |  |  |  | (505) | 505
Shares, Issued at Aug. 31, 2021 |  |  | 83,022 |  |  |  |  |  |  |  |
Ending Balance at Aug. 31, 2021 | 412,198 |  | $ 16,604 | $ 202,971 | $ (667,732) | $ 953,339 |  | $ (92,984) |  | $ (3,067) | $ 3,067
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 953,339 |  |  |  |  |  |  |  |  |  |

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