CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013
Income Statement [Abstract]
Net sales	$ 96,353	$ 95,541
Cost of products sold	46,652	45,868
Gross profit	49,701	49,673
Operating expenses:
Selling, general and administrative	27,424	26,699
Advertising and sales promotion	5,915	5,615
Amortization of definite-lived intangible assets	769	592
Total operating expenses	34,108	32,906
Income from operations	15,593	16,767
Other income (expense):
Interest income	134	131
Interest expense	(294)	(215)
Other income (expense), net	102	(214)
Income before income taxes	15,535	16,469
Provision for income taxes	4,749	4,987
Net income	$ 10,786	$ 11,482
Earnings per common share:
Basic	$ 0.73	$ 0.75
Diluted	$ 0.73	$ 0.74
Shares used in per share calculations:
Basic	14,668	15,279
Diluted	14,738	15,366
Dividends declared per common share	$ 0.34	$ 0.31