Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 160,771	$ 212,526	$ 498,667	$ 572,125
Lease revenue	3,782	1,733	8,286	8,422
Total operating revenues	164,553	214,259	506,953	580,547
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	152,807	205,168	474,955	551,274
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	7,964	7,358	23,712	20,851
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	142,571	188,693	442,430	515,360
Lease revenue	0	0	0	0
Total operating revenues	142,571	188,693	442,430	515,360
Irrigation [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	135,990	183,085	423,212	498,468
Irrigation [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	6,581	5,608	19,218	16,892
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	18,200	23,833	56,237	56,765
Lease revenue	3,782	1,733	8,286	8,422
Total operating revenues	21,982	25,566	64,523	65,187
Infrastructure [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	16,817	22,083	51,743	52,806
Infrastructure [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,383	$ 1,750	$ 4,494	$ 3,959