CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Consolidated Statements Of Operations [Abstract]
Net sales	$ 408,498	$ 423,350	$ 408,518
Cost of products sold	185,481	191,010	183,255
Gross profit	223,017	232,340	225,263
Operating expenses:
Selling, general and administrative	121,980	123,946	121,394
Advertising and sales promotion	21,606	23,306	22,314
Amortization of definite-lived intangible assets	2,211	2,706	2,951
Total operating expenses	145,797	149,958	146,659
Income from operations	77,220	82,382	78,604
Other (expense) income:
Interest income	93	155	454
Interest expense	(2,439)	(2,541)	(4,219)
Other income (expense), net	641	774	339
Income before income taxes	75,515	80,770	75,178
Provision for income taxes	14,805	24,862	9,963
Net income	$ 60,710	$ 55,908	$ 65,215
Earnings per common share:
Basic	$ 4.41	$ 4.03	$ 4.65
Diluted	$ 4.40	$ 4.02	$ 4.64
Shares used in per share calculations:
Basic	13,691	13,799	13,929
Diluted	13,719	13,830	13,962