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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Condensed Consolidated Statements Of Operations [Abstract]        
Net sales $ 85,966 $ 79,206 $ 170,911 $ 160,133
Cost of products sold 43,823 38,160 87,430 77,865
Gross profit 42,143 41,046 83,481 82,268
Operating expenses:        
Selling, general and administrative 21,907 21,629 44,544 43,278
Advertising and sales promotion 4,947 5,375 12,763 11,444
Amortization of definite-lived intangible assets 580 181 1,165 363
Total operating expenses 27,434 27,185 58,472 55,085
Income from operations 14,709 13,861 25,009 27,183
Other income (expense):        
Interest income 69 53 121 108
Interest expense (83) (219) (325) (541)
Other income (expense), net 8 (119) (172) 78
Income before income taxes 14,703 13,576 24,633 26,828
Provision for income taxes 4,119 4,468 7,257 8,641
Net income $ 10,584 $ 9,108 $ 17,376 $ 18,187
Earnings per common share:        
Basic $ 0.66 $ 0.53 $ 1.08 $ 1.07
Diluted $ 0.65 $ 0.53 $ 1.07 $ 1.06
Shares used in per share calculations:        
Basic 15,953 16,994 16,014 16,895
Diluted 16,069 17,172 16,137 17,081
Dividends declared per common share $ 0.29 $ 0.27 $ 0.56 $ 0.54