Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share and Shareholders' Equity Share Repurchase (Details)

v3.21.2
Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Feb. 28, 2021
Aug. 31, 2020
Feb. 29, 2020
Aug. 31, 2019
Equity [Abstract]                
Stock Repurchased During Period, Value   $ 17,800   $ 27,500        
Treasury Stock, Shares 22,799,230   22,799,230     22,799,230    
Stock Repurchase Program, Authorized Amount $ 667,700   $ 667,700          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 5,200,770   5,200,770          
Stock Repurchased During Period, Shares   839,789   1,343,662        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 416,911 $ 336,282 $ 416,911 $ 336,282 $ 381,393 $ 359,226 $ 354,365 $ 301,179
Net (loss) earnings 25,031 (4,999) 32,811 (716)        
Other Comprehensive (Loss) Income, Net of Tax 6,538 (6,586) 17,324 51,289        
Stock Issued During Period, Value, Employee Benefit Plan 97 97 279 354        
Stock Issued During Period, Value, Restricted Stock Award, Gross 0 0 0 0        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,157 3,184 7,384 12,814        
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (356) (147) (2,337) (4,210)        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 25 83 198 255        
Stock Issued During Period, Value, Stock Options Exercised 2,026 0 2,026 2,631        
Retained earnings $ 950,482   $ 950,482     $ 917,671    
Treasury Stock, Value, Acquired, Cost Method   $ 9,715   $ 27,520        
Stock Repurchased During Period, Shares   839,789   1,343,662        
Accounting Standards Update [Domain]                
Retained earnings   $ 206   $ 206        
Common Stock [Member]                
Stock Issued During Period, Shares, New Issues 82,991,000 82,563,000 82,991,000 82,563,000 82,879,000 82,594,000 82,540,000 81,919,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 16,598 $ 16,513 $ 16,598 $ 16,513 $ 16,576 $ 16,519 $ 16,508 $ 16,384
Stock Issued During Period, Shares, Employee Benefit Plan 5,000 6,000 15,000 17,000        
Stock Issued During Period, Value, Employee Benefit Plan $ 1 $ 1 $ 3 $ 3        
Stock Issued During Period, Shares, Restricted Stock Award, Gross 17,000 13,000 272,000 462,000        
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 3 $ 3 $ 54 $ 93        
Stock Issued To Acquired For And Distributed From Rabbi Trust 1,000 4,000 21,000 20,000        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 0 $ 1 $ 4 $ 4        
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 89,000 0 89,000 145,000        
Stock Issued During Period, Value, Stock Options Exercised $ 18 $ 0 $ 18 $ 29        
Additional Paid-in Capital [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 200,963 192,928 200,963 192,928 197,036 193,492 189,716 181,213
Stock Issued During Period, Value, Employee Benefit Plan 96 96 276 351        
Stock Issued During Period, Value, Restricted Stock Award, Gross (3) (3) (54) (93)        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,157 3,184 7,384 12,814        
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (356) (147) (2,337) (4,210)        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 25 82 194 251        
Stock Issued During Period, Value, Stock Options Exercised 2,008 0 2,008 2,602        
Treasury Stock [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (667,732) (667,732) (667,732) (667,732) (667,732) (667,732) (658,017) (640,212)
Treasury Stock, Value, Acquired, Cost Method   (9,715)   (27,520)        
Retained Earnings [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 950,482 918,623 950,482 918,623 925,451 917,671 923,622 915,466
Net (loss) earnings 25,031 (4,999) 32,811 (716)        
Retained Earnings [Member] | Accounting Standards Update [Domain]                
Retained earnings   3,873   3,873        
AOCI Attributable to Parent [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (83,400) (124,050) (83,400) (124,050) (89,938) (100,724) (117,464) (171,672)
Other Comprehensive (Loss) Income, Net of Tax 6,538 (6,586) 17,324 51,289        
AOCI Attributable to Parent [Member] | Accounting Standards Update [Domain]                
Retained earnings   (3,667)   (3,667)        
Stock held in trust [member] [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (2,999) (2,517) (2,999) (2,517) (2,996) (2,562) (2,434) (3,070)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust (3) (83) (437) 553        
Deferred Compensation, Share-based Payments [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,999 2,517 2,999 2,517 $ 2,996 $ 2,562 $ 2,434 $ 3,070
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 3 $ 83 $ 437 $ (553)