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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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- 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 -URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306 + Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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