Summary of Financial Information by Reportable Segment and Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	Aug. 31, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 120,654	$ 133,386	$ 240,084	$ 280,060
Operating Profit (Loss)	5,707	8,567	14,777	22,937
Assets	809,001		809,001		$ 824,294
Industrial Tools & Services [Member] [Domain]
Segment Reporting Information [Line Items]
Net Sales	112,739	123,361	224,914	258,953
Operating Profit (Loss)	13,857	20,570	31,014	46,624
Assets	615,018		615,018		592,086
Products [Member]
Segment Reporting Information [Line Items]
Net Sales	87,195	93,364	169,768	189,727
Service & Rental [Member]
Segment Reporting Information [Line Items]
Net Sales	25,544	29,997	55,146	69,226
Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	7,915	10,025	15,170	21,107
Operating Profit (Loss)	(1,873)	(972)	(3,682)	(1,227)
Assets	61,341		61,341		61,105
General Corporate
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(6,277)	$ (11,031)	(12,555)	$ (22,460)
Assets	$ 132,642		$ 132,642		$ 171,103