CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 317,096	$ 295,427	$ 881,216	$ 820,089
Cost of products sold	200,587	192,623	574,100	536,892
Gross profit	116,509	102,804	307,116	283,197
Selling, administrative and engineering expenses	77,570	70,051	220,550	205,609
Amortization of intangible assets	5,184	5,037	15,483	15,368
Director & officer transition charges	0	0	0	7,784
Restructuring charges	1,170	384	11,249	5,433
Impairment & divestiture charges		0	2,987	0
Operating profit	32,585	27,332	56,847	49,003
Financing costs, net	7,756	7,553	22,874	22,019
Other (income) expense, net	(188)	1,297	508	1,260
Earnings before income tax (benefit) expense	25,017	18,482	33,465	25,724
Income tax (benefit) expense	(3,995)	(4,029)	17,448	(6,827)
Net earnings	$ 29,012	$ 22,511	$ 16,017	$ 32,551
Earnings per share
Basic	$ 0.48	$ 0.38	$ 0.27	$ 0.55
Diluted	$ 0.48	$ 0.37	$ 0.26	$ 0.54
Weighted average common shares outstanding
Basic	60,683	59,675	60,291	59,339
Diluted	61,064	60,402	60,850	60,055
Viking [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment & divestiture charges	$ 0		$ 2,987