Industry Segment Information (Schedule of Segment Reporting Information Impacts on Statement of Operations, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2021	Nov. 30, 2020
Segment Reporting Information [Line Items]
Total operating revenues	$ 166,152	$ 108,485
Total operating income	13,361	7,535
Interest and other expense, net	(3,886)	(652)
Earnings before income taxes	9,475	6,883
Irrigation [Member]
Segment Reporting Information [Line Items]
Total operating revenues	145,909	87,356
Total operating income	17,212	10,633
Irrigation [Member] | North America [Member]
Segment Reporting Information [Line Items]
Total operating revenues	78,976	52,790
Irrigation [Member] | International [Member]
Segment Reporting Information [Line Items]
Total operating revenues	66,933	34,566
Infrastructure [Member]
Segment Reporting Information [Line Items]
Total operating revenues	20,243	21,129
Total operating income	2,766	4,256
Corporate Segment
Segment Reporting Information [Line Items]
Total operating income	$ (6,617)	$ (7,354)