Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2022	Nov. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 173,767	$ 161,363
Lease revenue	2,392	4,789
Total operating revenues	176,159	166,152
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	165,946	154,112
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	7,821	7,251
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	152,083	145,909
Lease revenue	0	0
Total operating revenues	152,083	145,909
Irrigation [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	145,716	139,400
Irrigation [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	6,367	6,509
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	21,684	15,454
Lease revenue	2,392	4,789
Total operating revenues	24,076	20,243
Infrastructure [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	20,230	14,712
Infrastructure [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,454	$ 742