Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Nov. 30, 2020
Aug. 31, 2020
Nov. 30, 2019
Aug. 31, 2019
Equity [Abstract]                
Stock Repurchased During Period, Value       $ 17,800        
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        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 381,393 $ 354,365 $ 381,393 $ 354,365 $ 367,946 $ 359,226 $ 353,253 $ 301,179
Net (loss) earnings 3,182 2,162 7,780 4,283        
Other Comprehensive (Loss) Income, Net of Tax 9,157 (3,052) 10,786 57,875        
Stock Issued During Period, Value, Employee Benefit Plan 81 126 182 257        
Stock Issued During Period, Value, Restricted Stock Award, Gross 0 0 0 0        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,647 3,093 5,227 9,630        
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (1,706) (1,425) (1,981) (4,063)        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 86 86 173 172        
Stock Issued During Period, Value, Stock Options Exercised   122   2,631        
Retained earnings $ 925,451   $ 925,451     $ 917,671    
Treasury Stock, Value, Acquired, Cost Method       17,805        
Accounting Standards Update [Domain]                
Retained earnings   $ 206   $ 206        
Common Stock [Member]                
Stock Issued During Period, Shares, New Issues 82,879,000 82,540,000 82,879,000 82,540,000 82,625,000 82,594,000 82,248,000 81,919,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 16,576 $ 16,508 $ 16,576 $ 16,508 $ 16,525 $ 16,519 $ 16,450 $ 16,384
Stock Issued During Period, Shares, Employee Benefit Plan 4,000 5,000 10,000 11,000        
Stock Issued During Period, Value, Employee Benefit Plan $ 1 $ 1 $ 2 $ 2        
Stock Issued During Period, Shares, Restricted Stock Award, Gross 235,000 259,000 255,000 449,000        
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 47 $ 52 $ 51 $ 90        
Stock Issued To Acquired For And Distributed From Rabbi Trust 15,000 11,000 20,000 16,000        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 3 $ 2 $ 4 $ 3        
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   17,000   145,000        
Stock Issued During Period, Value, Stock Options Exercised   $ 3   $ 29        
Additional Paid-in Capital [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 197,036 189,716 197,036 189,716 195,979 193,492 187,772 181,213
Stock Issued During Period, Value, Employee Benefit Plan 80 125 180 255        
Stock Issued During Period, Value, Restricted Stock Award, Gross (47) (52) (51) (90)        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,647 3,093 5,227 9,630        
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (1,706) (1,425) (1,981) (4,063)        
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 83 84 169 169        
Stock Issued During Period, Value, Stock Options Exercised   119   2,602        
Treasury Stock [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (667,732) (658,017) (667,732) (658,017) (667,732) (667,732) (658,017) (640,212)
Treasury Stock, Value, Acquired, Cost Method       (17,805)        
Retained Earnings [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 925,451 923,622 925,451 923,622 922,269 917,671 921,460 915,466
Net (loss) earnings 3,182 2,162 7,780 4,283        
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 (89,938) (117,464) (89,938) (117,464) (99,095) (100,724) (114,412) (171,672)
Other Comprehensive (Loss) Income, Net of Tax 9,157 (3,052) 10,786 57,875        
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 (2,996) (2,434) (2,996) (2,434) (2,643) (2,562) (3,157) (3,070)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust (353) 723 (434) 636        
Deferred Compensation, Share-based Payments [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,996 2,434 2,996 2,434 $ 2,643 $ 2,562 $ 3,157 $ 3,070
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 353 $ (723) $ 434 $ (636)