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Earnings per Share and Shareholders' Equity Shareholders Equity - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2023
Feb. 28, 2023
Nov. 30, 2022
May 31, 2022
Feb. 28, 2022
Nov. 30, 2021
May 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Statement of Stockholders' Equity [Abstract]                  
Stockholders' Equity Note Disclosure [Text Block]            
The following table illustrates the changes in the balances of each component of shareholders' equity for the nine months ended May 31, 2023 (in thousands):
 Common StockAdditional
Paid-in
Capital		Treasury
Stock		Retained
Earnings		Accumulated
Other
Comprehensive
Loss		Stock
Held in
Trust		Deferred
Compensation
Liability		Total
Shareholders’
Equity
 Issued
Shares		Amount
Balance at August 31, 202283,397 $16,679 $212,986 $(742,844)$966,751 $(134,961)$(3,209)$3,209 $318,611 
Net earnings— — — — 7,453 — — — 7,453 
Other comprehensive loss, net of tax— — — — — 6,024 — — 6,024 
Stock contribution to employee benefit plans and other3 1 41 — — — — — 42 
Vesting of equity awards84 17 (17)— — — — — — 
Stock based compensation expense— — 2,155 — — — — — 2,155 
Stock option exercises42 8 922 — — — — — 930 
Tax effect related to net share settlement of equity awards— — (969)— — — — — (969)
Stock issued to, acquired for and distributed from rabbi trust3 1 76 — — — (30)30 77 
Balance at November 30, 202283,529 $16,706 $215,194 $(742,844)$974,204 $(128,937)$(3,239)$3,239 $334,323 
Net earnings— — — — 4,497 — — — 4,497 
Other comprehensive income, net of tax— — — — — 1,243 — — 1,243 
Stock contribution to employee benefit plans and other2 — 49 — — — — — 49 
Vesting of equity awards173 34 (34)— — — — — — 
Stock based compensation expense— — 2,120 — — — — — 2,120 
Tax effect related to net share settlement of equity awards— — (1,505)— — — — — (1,505)
Stock issued to, acquired for and distributed from rabbi trust28 6 55 — — — (81)81 61 
Balance at February 28, 202383,732 $16,746 $215,879 $(742,844)$978,701 $(127,694)$(3,320)$3,320 $340,788 
Net earnings— — — — 12,380 — — — 12,380 
Other comprehensive loss, net of tax— — — — — 1,993 — — 1,993 
Stock contribution to employee benefit plans and other2 1 58 — — — — — 59 
Vesting of equity awards12 2 (2)— — — — — — 
Treasury stock repurchases— — — (20,831)— — — — (20,831)
Stock based compensation expense— — 2,207 — — — — — 2,207 
Stock option exercises2 — 43 — — — — — 43 
Tax effect related to net share settlement of equity awards— — (110)— — — — — (110)
Stock issued to, acquired for and distributed from rabbi trust4 1 89 — — — (85)85 90 
Balance at May 31, 202383,752 $16,750 $218,164 $(763,675)$991,081 $(125,701)$(3,405)$3,405 $336,619 
The following table illustrates the changes in the balances of each component of shareholders' equity for the nine months ended May 31, 2022 (in thousands):
 Common StockAdditional
Paid-in
Capital		Treasury
Stock		Retained
Earnings		Accumulated
Other
Comprehensive
Loss		Stock
Held in
Trust		Deferred
Compensation
Liability		Total
Shareholders’
Equity
 Issued
Shares		Amount
Balance at August 31, 202183,022 $16,604 $202,971 $(667,732)$953,339 $(92,984)$(3,067)$3,067 $412,198 
Net earnings— — — — 2,788 — — — 2,788 
Other comprehensive income, net of tax— — — — — (10,044)— — (10,044)
Stock contribution to employee benefit plans and other2 1 84 — — — — — 85 
Vesting of equity awards67 17 (17)— — — — — — 
Stock based compensation expense— — 6,147 — — — — — 6,147 
Tax effect related to net share settlement of equity awards— — (1,393)— — — — — (1,393)
Stock issued to, acquired for and distributed from rabbi trust1 — 25 — — — (25)25 25 
Balance at November 30, 202183,092 $16,622 $207,817 $(667,732)$956,127 $(103,028)$(3,092)$3,092 $409,806 
Net earnings— — — — 1,221 — — — 1,221 
Other comprehensive income, net of tax— — — — — 1,744 — — 1,744 
Stock contribution to employee benefit plans and other5 1 64 — — — — — 65 
Vesting of equity awards247 46 (46)— — — — — — 
Stock based compensation expense— — 2,142 — — — — — 2,142 
Tax effect related to net share settlement of equity awards— — (1,980)— — — — — (1,980)
Stock issued to, acquired for and distributed from rabbi trust1 — 25 — — — 3 (3)25 
Balance at February 28, 202283,345 $16,669 $208,022 $(667,732)$957,348 $(101,284)$(3,089)$3,089 $413,023 
Net earnings— — — — 1,643 — — — 1,643 
Other comprehensive income, net of tax— — — — — (16,030)— — (16,030)
Stock contribution to employee benefit plans and other4 1 65 — — — — — 66 
Treasury stock repurchases— — — (36,295)— — — — (36,295)
Stock based compensation expense— — 3,828 — — — — — 3,828 
Tax effect related to net share settlement of equity awards— — (3)— — — — — (3)
Stock issued to, acquired for and distributed from rabbi trust1 — 40 — — — (59)59 40 
Balance at May 31, 202283,350 $16,670 $211,952 $(704,027)$958,991 $(117,314)$(3,148)$3,148 $366,272 
    
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 336,619 $ 340,788 $ 334,323 $ 366,272 $ 413,023 $ 409,806 $ 336,619 $ 318,611 $ 412,198
Net (loss) earnings 12,380 4,497 7,453 1,643 1,221 2,788 24,330    
Other Comprehensive (Loss) Income, Net of Tax 1,993 1,243 6,024 (16,030) 1,744 (10,044) 9,260    
Stock Issued During Period, Value, Employee Benefit Plan 59 49 42 66 65 85      
Stock Issued During Period, Value, Restricted Stock Award, Gross 0 0 0   0 0      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,207 2,120 2,155 3,828 2,142 6,147      
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 90 61 77 40 25 25      
Adoption of Accounting Standards 991,081           $ 991,081 $ 966,751  
Adjustments to Additional Paid in Capital, Other (110) $ (1,505) (969) (3) $ (1,980) $ (1,393)      
Stock Issued During Period, Value, Stock Options Exercised 43   $ 930            
Treasury Stock, Value, Acquired, Cost Method $ (20,831)     $ (36,295)          
Common Stock [Member]                  
Statement [Line Items]                  
Stock Issued During Period, Shares, New Issues 83,752 83,732 83,529 83,350 83,345 83,092 83,752 83,397 83,022
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 16,750 $ 16,746 $ 16,706 $ 16,670 $ 16,669 $ 16,622 $ 16,750 $ 16,679 $ 16,604
Stock Issued During Period, Shares, Employee Benefit Plan 2 2 3 4 5 2      
Stock Issued During Period, Value, Employee Benefit Plan $ 1   $ 1 $ 1 $ 1 $ 1      
Stock Issued During Period, Shares, Restricted Stock Award, Gross 12 173 84   247 67      
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (2) $ (34) $ (17)   $ (46) $ (17)      
Stock Issued To Acquired For And Distributed From Rabbi Trust 4 28 3 1 1 1      
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 1 $ 6 $ 1     $ 0      
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 2   42            
Stock Issued During Period, Value, Stock Options Exercised     $ 8            
Additional Paid-in Capital [Member]                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 218,164 215,879 215,194 $ 211,952 $ 208,022 207,817 218,164 212,986 202,971
Stock Issued During Period, Value, Employee Benefit Plan 58 49 41 65 64 84      
Stock Issued During Period, Value, Restricted Stock Award, Gross 2 34 (17)   46 17      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,207 2,120 2,155 3,828 2,142 6,147      
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 89 55 76 40 25 25      
Adjustments to Additional Paid in Capital, Other (110) (1,505) (969) (3) (1,980) (1,393)      
Stock Issued During Period, Value, Stock Options Exercised 43   922            
Retained Earnings [Member]                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 991,081 978,701 974,204 958,991 957,348 956,127 991,081 966,751 953,339
Net (loss) earnings 12,380 4,497 7,453 1,643 1,221 2,788      
AOCI Attributable to Parent [Member]                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (125,701) (127,694) (128,937) (117,314) (101,284) (103,028) (125,701) (134,961) (92,984)
Other Comprehensive (Loss) Income, Net of Tax 1,993 1,243 6,024 (16,030) 1,744 (10,044)      
Stock held in trust [member] [Member]                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (3,405) (3,320) (3,239) (3,148) (3,089) (3,092) (3,405) (3,209) (3,067)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust (85) (81) (30) (59) 3 (25)      
Deferred Compensation, Share-based Payments [Member]                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 3,405 3,320 3,239 3,148 3,089 3,092 3,405 3,209 3,067
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 85 81 30 59 (3) 25      
Treasury Stock, Common                  
Statement [Line Items]                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (763,675) $ (742,844) $ (742,844) (704,027) $ (667,732) $ (667,732) $ (763,675) $ (742,844) $ (667,732)
Treasury Stock, Value, Acquired, Cost Method $ 20,831     $ 36,295