Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 212,526	$ 158,348	$ 572,125	$ 403,721
Lease revenue	1,733	3,588	8,422	10,277
Total operating revenues	214,259	161,936	580,547	413,998
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	205,168	147,822	551,274	375,020
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	7,358	10,526	20,851	28,701
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	188,693	140,175	515,360	346,104
Lease revenue	0	0	0	0
Total operating revenues	188,693	140,175	515,360	346,104
Irrigation [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	183,085	131,032	498,468	321,960
Irrigation [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	5,608	9,143	16,892	24,144
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	23,833	18,173	56,765	57,617
Lease revenue	1,733	3,588	8,422	10,277
Total operating revenues	25,566	21,761	65,187	67,894
Infrastructure [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	22,083	16,790	52,806	53,060
Infrastructure [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,750	$ 1,383	$ 3,959	$ 4,557