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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Net sales $ 95,264 $ 84,945
Cost of products sold 47,537 43,607
Gross profit 47,727 41,338
Operating expenses:    
Selling, general and administrative 25,329 22,637
Advertising and sales promotion 6,067 7,816
Amortization of definite-lived intangible assets 466 585
Total operating expenses 31,862 31,038
Income from operations 15,865 10,300
Other income (expense):    
Interest income 62 52
Interest expense (125) (242)
Other income (expense), net 52 (180)
Income before income taxes 15,854 9,930
Provision for income taxes 4,910 3,138
Net income $ 10,944 $ 6,792
Earnings per common share:    
Basic $ 0.69 $ 0.42
Diluted $ 0.69 $ 0.42
Shares used in per share calculations:    
Basic 15,693 16,074
Diluted 15,807 16,205
Dividends declared per common share $ 0.29 $ 0.27