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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 140,926	$ 112,254	$ 245,372	$ 218,868
Lease revenue	2,651	1,534	6,690	4,313
Total operating revenues	143,577	113,788	252,062	223,181
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	118,572	93,494	205,929	176,820
Lease revenue	0	0	0	0
Total operating revenues	118,572	93,494	205,929	176,820
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	22,354	18,760	39,443	42,048
Lease revenue	2,651	1,534	6,690	4,313
Total operating revenues	25,005	20,294	46,133	46,361
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	131,633	91,178	227,195	186,159
Point in Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	110,814	73,844	190,926	147,661
Point in Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	20,819	17,334	36,269	38,498
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	9,293	21,076	18,177	32,709
Over Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	7,758	19,650	15,003	29,159
Over Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,535	$ 1,426	$ 3,174	$ 3,550

X

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Amount of direct financing lease revenue.

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