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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Net sales $ 97,597 $ 89,248
Cost of products sold 43,400 38,208
Gross profit 54,197 51,040
Operating expenses:    
Selling, general and administrative 31,217 28,991
Advertising and sales promotion 5,115 4,812
Amortization of definite-lived intangible assets 729 721
Total operating expenses 37,061 34,524
Income from operations 17,136 16,516
Other income (expense):    
Interest income 133 147
Interest expense (841) (531)
Other income 128 264
Income before income taxes 16,556 16,396
Provision for income taxes 3,926 4,638
Net income $ 12,630 $ 11,758
Earnings per common share:    
Basic $ 0.90 $ 0.82
Diluted $ 0.90 $ 0.82
Shares used in per share calculations:    
Basic 13,976 14,180
Diluted 14,011 14,221
Dividends declared per common share $ 0.49 $ 0.42