Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 164,130	$ 198,236	$ 337,897	$ 359,599
Lease revenue	2,111	1,901	4,503	6,689
Total operating revenues	166,241	200,137	342,400	366,288
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	156,225	191,261	322,172	346,106
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	7,905	6,975	15,725	13,493
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	147,776	180,759	299,859	326,667
Lease revenue	0	0	0	0
Total operating revenues	147,776	180,759	299,859	326,667
Irrigation [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	141,528	175,251	287,245	315,383
Irrigation [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	6,248	5,508	12,614	11,284
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	16,354	17,477	38,038	32,932
Lease revenue	2,111	1,901	4,503	6,689
Total operating revenues	18,465	19,378	42,541	39,621
Infrastructure [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	14,697	16,010	34,927	30,723
Infrastructure [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,657	$ 1,467	$ 3,111	$ 2,209