Quarterly report pursuant to Section 13 or 15(d)

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

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Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 150 Months Ended
Dec. 18, 2023
Dec. 18, 2023
Feb. 29, 2024
Feb. 29, 2024
Nov. 30, 2023
Feb. 28, 2023
Nov. 30, 2022
Feb. 29, 2024
Feb. 28, 2023
Feb. 29, 2024
Aug. 31, 2023
Aug. 31, 2022
Equity [Abstract]                        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased     2,932,284 2,932,284       2,932,284   2,932,284    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 336,926 $ 336,926 $ 321,676 $ 340,788 $ 334,323 $ 336,926 $ 340,788 $ 336,926 $ 326,620 $ 318,611
Net (loss) earnings       17,817 17,738 4,497 7,453 35,555 11,950      
Other Comprehensive (Loss) Income, Net of Tax       (1,207) 370 1,243 6,024 (837) $ 7,267      
Stock Issued During Period, Value, Employee Benefit Plan       35 51 49 42          
Stock Issued During Period, Value, Restricted Stock Award, Gross       0 0 0 0          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       2,810 2,717 2,120 2,155          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust       263 90 $ 61 $ 77          
Retained earnings     222,047 222,047       222,047   222,047 1,011,112  
Treasury Stock, Value     $ 0 0       $ 0   0 $ 800,506  
Treasury Stock, Value, Acquired, Cost Method       $ 3,992 $ 26,116         $ 830,600    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     10,000,000 10,000,000       10,000,000   10,000,000    
Treasury Stock, Common, Shares     0 0       0   0 28,772,715  
Stock Repurchased During Period, Shares   113,587   139,324       1,094,231        
Stock Repurchased During Period, Value       $ 30,100                
Treasury Stock, Shares, Acquired                   29,866,946    
Treasury Stock, Shares, Retired 29,841,209                      
Stock Repurchased and Retired During Period, Shares     25,737                  
Common Stock [Member]                        
Stock Issued During Period, Shares, New Issues     54,253,000 54,253,000 83,967,000 83,732,000 83,529,000 54,253,000 83,732,000 54,253,000 83,761,000 83,397,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 10,851 $ 10,851 $ 16,793 $ 16,746 $ 16,706 $ 10,851 $ 16,746 $ 10,851 $ 16,752 $ 16,679
Stock Issued During Period, Shares, Employee Benefit Plan       1,000 2,000 2,000 3,000          
Stock Issued During Period, Value, Employee Benefit Plan         $ 0 $ 0 $ 1          
Stock Issued During Period, Shares, Restricted Stock Award, Gross       105,000 118,000 173,000 84,000          
Stock Issued During Period, Value, Restricted Stock Award, Gross       $ 21 $ 23 $ 34 $ 17          
Stock Issued To Acquired For And Distributed From Rabbi Trust       26,000 3,000 28,000 3,000          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust       $ 5 $ 1   $ 1          
Treasury Stock, Shares, Retired       (29,867,000)                
Additional Paid-in Capital [Member]                        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     226,075 $ 226,075 223,474 $ 215,879 215,194 226,075 215,879 226,075 220,472 212,986
Stock Issued During Period, Value, Employee Benefit Plan       35 51 49 41          
Stock Issued During Period, Value, Restricted Stock Award, Gross       (21) 23 (34) (17)          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       2,810 2,717 2,120 2,155          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust       258 89 55 76          
Stock Repurchased and Retired During Period, Value       824,600                
Retained Earnings [Member]                        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     222,047 222,047 1,028,871 978,701 974,204 222,047 978,701 222,047 1,011,112 966,751
Net (loss) earnings       17,817 17,738 4,497 7,453          
AOCI Attributable to Parent [Member]                        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (122,047) (122,047) (120,840) (127,694) (128,937) (122,047) (127,694) (122,047) (121,210) (134,961)
Other Comprehensive (Loss) Income, Net of Tax       (1,207) 370 1,243 6,024          
Stock held in trust [member] [Member]                        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (3,777) (3,777) (3,576) (3,320) (3,239) (3,777) (3,320) (3,777) (3,484) (3,209)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust       (201) (92) (81) (30)          
Deferred Compensation, Share-based Payments [Member]                        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 3,777 3,777 3,576 3,320 3,239 $ 3,777 $ 3,320 $ 3,777 $ 3,484 $ 3,209
Stock Value Issued to Acquired For and Distributed From Rabbi Trust       201 $ 92 $ 81 $ 30          
Par Value                        
Stock Repurchased and Retired During Period, Value       $ 6,000