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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Beginning balance at Aug. 31, 2017 $ 20 $ 150,692 $ 315,764 $ (28,075) $ (299,014) $ 139,387
Beginning balance, shares at Aug. 31, 2017 19,688,238       5,704,055  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (1,548)       (1,548)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 32,279          
Stock-based compensation   1,777       1,777
Cash dividends     (6,888)     (6,888)
Acquisition of treasury stock         $ (3,893) (3,893)
Acquisition of treasury stock, shares         35,250  
Foreign currency translation adjustment       3,827   3,827
Net income     12,630     12,630
Ending balance at Nov. 30, 2017 $ 20 151,110 321,378 (24,248) $ (302,907) 145,353
Ending balance, shares at Nov. 30, 2017 19,720,517       5,739,305  
Beginning balance at Aug. 31, 2017 $ 20 150,692 315,764 (28,075) $ (299,014) 139,387
Beginning balance, shares at Aug. 31, 2017 19,688,238       5,704,055  
Foreign currency translation adjustment           3,273
Net income           43,578
Ending balance at May. 31, 2018 $ 20 152,953 337,169 (24,802) $ (316,798) 148,542
Ending balance, shares at May. 31, 2018 19,729,708       5,849,061  
Cumulative effect of change in accounting principle   189 (128)     61
Beginning balance at Nov. 30, 2017 $ 20 151,110 321,378 (24,248) $ (302,907) 145,353
Beginning balance, shares at Nov. 30, 2017 19,720,517       5,739,305  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (35)       (35)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 8,875          
Stock-based compensation   1,461       1,461
Cash dividends     (7,598)     (7,598)
Acquisition of treasury stock         $ (7,484) (7,484)
Acquisition of treasury stock, shares         61,150  
Foreign currency translation adjustment       7,827   7,827
Net income     14,818     14,818
Ending balance at Feb. 28, 2018 $ 20 152,536 328,598 (16,421) $ (310,391) 154,342
Ending balance, shares at Feb. 28, 2018 19,729,392       5,800,455  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (19)       (19)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 316          
Stock-based compensation   436       436
Cash dividends     (7,559)     (7,559)
Acquisition of treasury stock         $ (6,407) (6,407)
Acquisition of treasury stock, shares         48,606  
Foreign currency translation adjustment       (8,381)   (8,381)
Net income     16,130     16,130
Ending balance at May. 31, 2018 $ 20 152,953 337,169 (24,802) $ (316,798) 148,542
Ending balance, shares at May. 31, 2018 19,729,708       5,849,061  
Beginning balance at Aug. 31, 2018 $ 20 153,469 351,266 (27,636) $ (321,630) $ 155,489
Beginning balance, shares at Aug. 31, 2018 19,729,774       5,879,361 13,850,413
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (2,425)       $ (2,425)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 24,062          
Stock-based compensation   1,965       1,965
Cash dividends     (7,522)     (7,522)
Acquisition of treasury stock         $ (6,863) (6,863)
Acquisition of treasury stock, shares         41,184  
Foreign currency translation adjustment       (1,631)   (1,631)
Net income     13,279     13,279
Ending balance at Nov. 30, 2018 $ 20 153,009 356,699 (29,267) $ (328,493) 151,968
Ending balance, shares at Nov. 30, 2018 19,753,836       5,920,545  
Beginning balance at Aug. 31, 2018 $ 20 153,469 351,266 (27,636) $ (321,630) $ 155,489
Beginning balance, shares at Aug. 31, 2018 19,729,774       5,879,361 13,850,413
Foreign currency translation adjustment           $ (3,724)
Net income           47,324
Ending balance at May. 31, 2019 $ 20 154,983 373,896 (31,458) $ (344,014) $ 153,427
Ending balance, shares at May. 31, 2019 19,770,339       6,011,545 13,758,794
Cumulative effect of change in accounting principle     (324)     $ (324)
Beginning balance at Nov. 30, 2018 $ 20 153,009 356,699 (29,267) $ (328,493) 151,968
Beginning balance, shares at Nov. 30, 2018 19,753,836       5,920,545  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (8)       (8)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 16,503          
Stock-based compensation   1,393       1,393
Cash dividends     (8,489)     (8,489)
Acquisition of treasury stock         $ (5,198) (5,198)
Acquisition of treasury stock, shares         29,500  
Foreign currency translation adjustment       313   313
Net income     15,906     15,906
Ending balance at Feb. 28, 2019 $ 20 154,394 364,116 (28,954) $ (333,691) 155,885
Ending balance, shares at Feb. 28, 2019 19,770,339       5,950,045  
Stock-based compensation   589       589
Cash dividends     (8,457)     (8,457)
Acquisition of treasury stock         $ (10,323) (10,323)
Acquisition of treasury stock, shares         61,500  
Foreign currency translation adjustment       (2,406)   (2,406)
Net income     18,139     18,139
Ending balance at May. 31, 2019 $ 20 $ 154,983 373,896 (31,458) $ (344,014) $ 153,427
Ending balance, shares at May. 31, 2019 19,770,339       6,011,545 13,758,794
Cumulative effect of change in accounting principle     $ 98 $ (98)