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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Total
Beginning balance at Aug. 31, 2010 $ 18 $ 93,101 $ 157,805 $ (4,334) $ (50,066) $ 196,524
Beginning balance, shares at Aug. 31, 2010 18,251,142       1,563,498  
Issuance of common stock upon settlements of stock-based equity awards 1 19,523       19,524
Issuance of common stock upon settlements of stock-based equity awards, shares 697,726          
Stock-based compensation   3,033       3,033
Tax benefits from settlements of stock-based equity awards   1,365       1,365
Cash dividends     (18,230)     (18,230)
Acquisition of treasury stock         (41,399) (41,399)
Acquisition of treasury stock, shares         1,017,457  
Foreign currency translation adjustment       3,976   3,976
Net income     36,433     36,433
Ending balance at Aug. 31, 2011 19 117,022 176,008 (358) (91,465) 201,226
Ending balance, shares at Aug. 31, 2011 18,948,868       2,580,955  
Issuance of common stock upon settlements of stock-based equity awards   5,710       5,710
Issuance of common stock upon settlements of stock-based equity awards, shares 259,977          
Stock-based compensation   2,769       2,769
Tax benefits from settlements of stock-based equity awards   709       709
Cash dividends     (18,228)     (18,228)
Acquisition of treasury stock         (39,840) (39,840)
Acquisition of treasury stock, shares         930,356  
Foreign currency translation adjustment       (2,369)   (2,369)
Net income     35,485     35,485
Ending balance at Aug. 31, 2012 19 126,210 193,265 (2,727) (131,305) 185,462
Ending balance, shares at Aug. 31, 2012 19,208,845       3,511,311  
Issuance of common stock upon settlements of stock-based equity awards   3,685       3,685
Issuance of common stock upon settlements of stock-based equity awards, shares 184,134          
Stock-based compensation   2,453       2,453
Tax benefits from settlements of stock-based equity awards   891       891
Cash dividends     (19,044)     (19,044)
Acquisition of treasury stock         (31,437) (31,437)
Acquisition of treasury stock, shares         596,132  
Foreign currency translation adjustment       (2,316)   (2,316)
Net income     39,813     39,813
Ending balance at Aug. 31, 2013 $ 19 $ 133,239 $ 214,034 $ (5,043) $ (162,742) $ 179,507
Ending balance, shares at Aug. 31, 2013 19,392,979       4,107,443