Industry Segment Information (Schedule of Segment Reporting Information Impacts on Statement of Operations, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
Segment Reporting Information [Line Items]
Total operating revenues	$ 139,199	$ 164,553	$ 452,076	$ 506,953
Total operating income	19,936	26,957	63,108	78,820
Interest and other expense, net	237	(1,225)	757	(3,350)
Earnings before income taxes	20,173	25,732	63,865	75,470
Irrigation [Member]
Segment Reporting Information [Line Items]
Total operating revenues	114,840	142,571	388,026	442,430
Total operating income	19,524	30,727	70,480	92,188
Irrigation [Member] | North America [Member]
Segment Reporting Information [Line Items]
Total operating revenues	68,235	75,027	240,457	249,315
Irrigation [Member] | International [Member]
Segment Reporting Information [Line Items]
Total operating revenues	46,605	67,544	147,569	193,115
Infrastructure [Member]
Segment Reporting Information [Line Items]
Total operating revenues	24,359	21,982	64,050	64,523
Total operating income	6,276	3,556	13,401	8,947
Corporate Segment
Segment Reporting Information [Line Items]
Total operating income	$ (5,864)	$ (7,326)	$ (20,773)	$ (22,315)