Quarterly report pursuant to Section 13 or 15(d)

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

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Earnings per Share and Shareholders' Equity Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Aug. 31, 2019
Aug. 31, 2018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 353,253 $ 537,565 $ 301,179 $ 558,712
Net earnings (loss) 2,121 (17,452)    
Other Comprehensive Income (Loss), Net of Tax 60,927 (7,944)    
Stock Issued During Period, Value, Employee Benefit Plan 131 118    
Stock Issued During Period, Value, Restricted Stock Award, Gross 0 0    
Stock Repurchased During Period, Value (17,805) 0    
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 6,537 3,594    
Stock Issued During Period, Value, Stock Options Exercised 2,509 434    
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (2,638) (201)    
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 86 229    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ 206 $ 75    
Common Stock [Member]        
Stock Issued During Period, Shares, New Issues 82,248 81,503 81,919 81,424
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 16,450 $ 16,301 $ 16,384 $ 16,285
Stock Issued During Period, Shares, Employee Benefit Plan 6 5    
Stock Issued During Period, Value, Employee Benefit Plan $ 1 $ 1    
Stock Issued During Period, Shares, Restricted Stock Award, Gross 190 46    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 38 $ 9    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 128 20    
Stock Issued During Period, Value, Stock Options Exercised $ 26 $ 4    
Stock Issued To Acquired For And Distributed From Rabbi Trust 5 8    
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 1 $ 2    
Additional Paid-in Capital [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 187,772 171,606 181,213 167,448
Stock Issued During Period, Value, Employee Benefit Plan 130 117    
Stock Issued During Period, Value, Restricted Stock Award, Gross (38) (9)    
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 6,537 3,594    
Stock Issued During Period, Value, Stock Options Exercised 2,483 430    
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 2,638 201    
Stock Value Issued to Acquired For and Distributed From Rabbi Trust 85 227    
Treasury Stock [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (658,017) (617,731) (640,212) (617,731)
Stock Repurchased During Period, Value (17,805)      
Retained Earnings [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 921,460 1,149,578 915,466 1,166,955
Net earnings (loss) 2,121 (17,452)    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets 3,873 75    
AOCI Attributable to Parent [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (114,412) (182,189) (171,672) (174,245)
Other Comprehensive Income (Loss), Net of Tax 60,927 (7,944)    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets (3,667)      
Stock held in trust [member] [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (3,157) (2,573) (3,070) (2,450)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust (87) (123)    
Deferred Compensation, Share-based Payments [Member]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 3,157 2,573 $ 3,070 $ 2,450
Stock Value Issued to Acquired For and Distributed From Rabbi Trust $ 87 $ 123