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CONSOLIDATED STATEMENTS 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, 2015 $ 20 $ 141,651 $ 260,683 $ (8,722) $ (235,774) $ 157,858
Beginning balance, shares at Aug. 31, 2015 19,546,888       5,096,398  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (1,434)       (1,434)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 74,932          
Stock-based compensation   3,655       3,655
Tax benefits from settlements of stock-based equity awards   2,064       2,064
Cash dividends     (23,669)     (23,669)
Acquisition of treasury stock         $ (32,131) (32,131)
Acquisition of treasury stock, shares         317,084  
Foreign currency translation adjustment       (18,576)   (18,576)
Net income     52,628     52,628
Ending balance at Aug. 31, 2016 $ 20 145,936 289,642 (27,298) $ (267,905) 140,395
Ending balance, shares at Aug. 31, 2016 19,621,820       5,413,482  
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (921)       (921)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 66,418          
Stock-based compensation   4,138       4,138
Tax benefits from settlements of stock-based equity awards   1,539       1,539
Cash dividends     (26,808)     (26,808)
Acquisition of treasury stock         $ (31,109) (31,109)
Acquisition of treasury stock, shares         290,573  
Foreign currency translation adjustment       (777)   (777)
Net income     52,930     52,930
Ending balance at Aug. 31, 2017 $ 20 150,692 315,764 (28,075) $ (299,014) $ 139,387
Ending balance, shares at Aug. 31, 2017 19,688,238       5,704,055 13,984,183
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes   (1,607)       $ (1,607)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares 41,536          
Stock-based compensation   4,195       4,195
Cash dividends     (29,585)     (29,585)
Acquisition of treasury stock         $ (22,616) (22,616)
Acquisition of treasury stock, shares         175,306  
Foreign currency translation adjustment       439   439
Net income     65,215     65,215
Ending balance at Aug. 31, 2018 $ 20 153,469 351,266 $ (27,636) $ (321,630) $ 155,489
Ending balance, shares at Aug. 31, 2018 19,729,774       5,879,361 13,850,413
Cumulative effect of change in accounting principle   $ 189 $ (128)     $ 61