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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Consolidated Statements Of Operations [Abstract]      
Net sales $ 408,518 $ 380,506 $ 380,670
Cost of products sold 183,255 166,621 166,301
Gross profit 225,263 213,885 214,369
Operating expenses:      
Selling, general and administrative 121,394 114,560 117,767
Advertising and sales promotion 22,314 20,537 22,278
Amortization of definite-lived intangible assets 2,951 2,879 2,976
Total operating expenses 146,659 137,976 143,021
Income from operations 78,604 75,909 71,348
Other income (expense):      
Interest income 454 508 683
Interest expense (4,219) (2,582) (1,703)
Other income 339 787 2,461
Income before income taxes 75,178 74,622 72,789
Provision for income taxes 9,963 21,692 20,161
Net income $ 65,215 $ 52,930 $ 52,628
Earnings per common share:      
Basic $ 4.65 $ 3.73 $ 3.65
Diluted $ 4.64 $ 3.72 $ 3.64
Shares used in per share calculations:      
Basic 13,929 14,089 14,332
Diluted 13,962 14,123 14,379