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
 3 Months Ended 6 Months Ended 126 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Nov. 30, 2021
Aug. 31, 2021
Nov. 30, 2020
Aug. 31, 2020
Equity [Abstract]                  
Treasury Stock, Shares 22,799,230   22,799,230   22,799,230   22,799,230    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 5,200,770   5,200,770   5,200,770        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 413,023 $ 381,393 $ 413,023 $ 381,393 $ 413,023 $ 409,806 $ 412,198 $ 367,946 $ 359,226
Net (loss) earnings 1,221 3,182 4,009 7,780          
Other Comprehensive (Loss) Income, Net of Tax 1,744 9,157 (8,300) 10,786          
Stock Issued During Period, Value, Employee Benefit Plan 65 81 150 182          
Stock Issued During Period, Value, Restricted Stock Award, Gross 0 0 0 0          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,142 2,647 8,289 5,227          
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (1,980) (1,706) (3,373) (1,981)          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 25 $ 86 50 $ 173          
Retained earnings 957,348   957,348   957,348   953,339    
Treasury Stock, Value $ 667,732   $ 667,732   667,732   $ 667,732    
Treasury Stock, Value, Acquired, Cost Method         $ 667,700        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 5,200,770   5,200,770   5,200,770        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 10,000,000   10,000,000   10,000,000        
Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues 83,345,000 82,879,000 83,345,000 82,879,000 83,345,000 83,092,000 83,022,000 82,625,000 82,594,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 16,669 $ 16,576 $ 16,669 $ 16,576 $ 16,669 $ 16,622 $ 16,604 $ 16,525 $ 16,519
Stock Issued During Period, Shares, Employee Benefit Plan 5,000 4,000 7,000 10,000          
Stock Issued During Period, Value, Employee Benefit Plan $ 1 $ 1 $ 2 $ 2          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 247,000 235,000 314,000 255,000          
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 46 $ 47 $ 63 $ 51          
Stock Issued To Acquired For And Distributed From Rabbi Trust 1,000 15,000 2,000 20,000          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 0 $ 3   $ 4          
Additional Paid-in Capital [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 208,022 197,036 $ 208,022 197,036 208,022 207,817 202,971 195,979 193,492
Stock Issued During Period, Value, Employee Benefit Plan 64 80 148 180          
Stock Issued During Period, Value, Restricted Stock Award, Gross (46) (47) (63) (51)          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,142 2,647 8,289 5,227          
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (1,980) (1,706) (3,373) (1,981)          
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 25 83 50 169          
Treasury Stock [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (667,732) (667,732) (667,732) (667,732) (667,732) (667,732) (667,732) (667,732) (667,732)
Retained Earnings [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 957,348 925,451 957,348 925,451 957,348 956,127 953,339 922,269 917,671
Net (loss) earnings 1,221 3,182 4,009 7,780          
AOCI Attributable to Parent [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (101,284) (89,938) (101,284) (89,938) (101,284) (103,028) (92,984) (99,095) (100,724)
Other Comprehensive (Loss) Income, Net of Tax 1,744 9,157 (8,300) 10,786          
Stock held in trust [member] [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (3,089) (2,996) (3,089) (2,996) (3,089) (3,092) (3,067) (2,643) (2,562)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 3 (353) (22) (434)          
Deferred Compensation, Share-based Payments [Member]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 3,089 2,996 3,089 2,996 $ 3,089 $ 3,092 $ 3,067 $ 2,643 $ 2,562
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ (3) $ 353 $ 22 $ 434