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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Condensed Consolidated Statements Of Operations [Abstract]    
Net sales $ 101,282 $ 97,597
Cost of products sold 45,451 43,400
Gross profit 55,831 54,197
Operating expenses:    
Selling, general and administrative 32,731 31,217
Advertising and sales promotion 5,966 5,115
Amortization of definite-lived intangible assets 733 729
Total operating expenses 39,430 37,061
Income from operations 16,401 17,136
Other income (expense):    
Interest income 51 133
Interest expense (710) (841)
Other income 376 128
Income before income taxes 16,118 16,556
Provision for income taxes 2,839 3,926
Net income $ 13,279 $ 12,630
Earnings per common share:    
Basic $ 0.95 $ 0.90
Diluted $ 0.95 $ 0.90
Shares used in per share calculations:    
Basic 13,846 13,976
Diluted 13,882 14,011