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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 106,614	$ 110,347
Lease revenue	2,779	1,604
Operating revenues	109,393	111,951
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	82,352	87,610
Lease revenue	0	0
Operating revenues	82,352	87,610
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	24,262	22,737
Lease revenue	2,779	1,604
Operating revenues	27,041	24,341
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	94,980	102,333
Point in Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	73,375	81,086
Point in Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	21,605	21,247
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	11,634	8,014
Over Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	8,977	6,524
Over Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 2,657	$ 1,490

X

- Definition

Amount of direct financing lease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 280
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