CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 30, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Revenue
Sales	$ 56,746	$ 247,877	$ 234,450	$ 234,890
Royalties and commissions		4,683	3,644	3,156
Total revenues		252,560	238,094	238,046
Costs and Expenses
Cost of products and services sold		146,036	144,438	149,202
Selling, general and administrative expenses		47,736	44,574	46,015
Exit costs related to idle facility (Note 20)		70	935
Acquisition related costs (Note 14)		584		584
Write-down of certain assets under construction (Note 18)	365		365
Operating income		58,134	47,782	42,245
Interest expense		(839)	(1,054)	(1,063)
Gain on sale of real estate		860
Gain on sale of business (Note 18)		(2,013)	(1,031)
Other income (expense)		724	2,351	44
Income before income taxes		60,892	50,110	41,226
Income taxes		18,878	17,303	14,813
Add: net (income) loss attributable to noncontrolling interest				(95)
Net income	$ 7,449	$ 42,014	$ 32,807	$ 26,318
Net income available to common shareholders, per common and common equivalent share (Note 17)
Basic (in dollars per share)	$ 0.81	$ 4.49	$ 3.55	$ 2.87
Diluted (in dollars per share)	$ 0.80	$ 4.44	$ 3.50	$ 2.82
Weighted average shares outstanding
Basic (in shares)		9,249,343	9,167,333	9,086,043
Diluted (in shares)		9,357,414	9,294,077	9,254,054
Annual cash dividends declared per share		$ 0.70	$ 0.65	$ 0.60