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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net sales $ 87,022 $ 85,536 $ 257,933 $ 245,669
Cost of products sold 43,940 43,397 131,370 121,262
Gross profit 43,082 42,139 126,563 124,407
Operating expenses:        
Selling, general and administrative 22,736 22,588 67,280 65,866
Advertising and sales promotion 6,702 7,121 19,465 18,565
Amortization of definite-lived intangible assets 504 587 1,669 950
Total operating expenses 29,942 30,296 88,414 85,381
Income from operations 13,140 11,843 38,149 39,026
Other income (expense):        
Interest income 61 59 182 167
Interest expense (159) (277) (484) (818)
Other (expense) income, net (170) 119 (342) 197
Income before income taxes 12,872 11,744 37,505 38,572
Provision for income taxes 3,736 3,684 10,993 12,325
Net income $ 9,136 $ 8,060 $ 26,512 $ 26,247
Earnings per common share:        
Basic $ 0.57 $ 0.48 $ 1.65 $ 1.55
Diluted $ 0.57 $ 0.47 $ 1.64 $ 1.53
Shares used in per share calculations:        
Basic 15,872 16,851 15,966 16,880
Diluted 16,008 17,027 16,094 17,063
Dividends declared per common share $ 0.29 $ 0.27 $ 0.85 $ 0.81