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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, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | $ 107,975 |  | $ 218,322 |
Lease revenue | 1,207 |  | 2,811 |
Operating revenues | 109,182 | $ 130,339 | 221,133 | $ 254,865
Irrigation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 95,766 |  | 183,376 |
Lease revenue | 0 |  | 0 |
Operating revenues | 95,766 | 111,865 | 183,376 | 215,218
Infrastructure [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 12,209 |  | 34,946 |
Lease revenue | 1,207 |  | 2,811 |
Operating revenues | 13,416 | $ 18,474 | 37,757 | $ 39,647
Point in Time [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 96,856 |  | 199,189 |
Point in Time [Member] | Irrigation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 85,939 |  | 167,025 |
Point in Time [Member] | Infrastructure [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 10,917 |  | 32,164 |
Over Time [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 11,119 |  | 19,133 |
Over Time [Member] | Irrigation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | 9,827 |  | 16,351 |
Over Time [Member] | Infrastructure [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from the contracts with customers | $ 1,292 |  | $ 2,782 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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