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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning balance, value at Aug. 31, 2012 $ 18,421 $ 43,140 $ 341,115 $ (90,961) $ (877) $ 310,838
Beginning balance, shares at Aug. 31, 2012 18,421,000     5,698,000    
Net earnings     70,570     70,570
Other comprehensive income (loss)         (1,439) (1,439)
Total comprehensive income           69,131
Cash dividends per share     (6,105)     (6,105)
Issuance of common shares under share compensation plans, value $ 150 (555)       (405)
Issuance of common shares under share compensation plans, shares 150,000          
Excess tax benefits from share-based compensation   2,800       2,800
Share-based compensation expense   4,379       4,379
Ending balance, value at Aug. 31, 2013 $ 18,571 49,764 405,580 $ (90,961) (2,316) 380,638
Ending Balance, shares at Aug. 31, 2013 18,571,000     5,698,000    
Net earnings     51,512     51,512
Other comprehensive income (loss)         115 115
Total comprehensive income           51,627
Cash dividends per share     (11,726)     (11,726)
Repurchase of common stock, value       $ (41,059)   $ (41,059)
Repurchase of common stock, shares       498,000   497,899
Issuance of common shares under share compensation plans, value $ 65 (1,639)       $ (1,574)
Issuance of common shares under share compensation plans, shares 65,000          
Excess tax benefits from share-based compensation   722       722
Share-based compensation expense   4,019       4,019
Ending balance, value at Aug. 31, 2014 $ 18,636 52,866 445,366 $ (132,020) (2,201) 382,647
Ending Balance, shares at Aug. 31, 2014 18,636,000     6,196,000    
Net earnings     26,309     26,309
Other comprehensive income (loss)         (13,107) (13,107)
Total comprehensive income           13,202
Cash dividends per share     (12,772)     (12,772)
Repurchase of common stock, value       $ (96,883)   $ (96,883)
Repurchase of common stock, shares       1,198,000   1,198,089
Issuance of common shares under share compensation plans, value $ 48 (1,360)       $ (1,312)
Issuance of common shares under share compensation plans, shares 48,000          
Excess tax benefits from share-based compensation   576       576
Share-based compensation expense   3,102       3,102
Ending balance, value at Aug. 31, 2015 $ 18,684 $ 55,184 $ 458,903 $ (228,903) $ (15,308) $ 288,560
Ending Balance, shares at Aug. 31, 2015 18,684,000     7,394,000