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Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 01, 2014 | Aug. 31, 2017 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |  |  |
Buyout of capital lease obligations, percent |  | 58.00% | 58.00% |  |
Capital Leased Assets, Gross |  | $ 58,200 | $ 58,200 | $ 206,300 |
Capital Leased Assets, Accumulated Amortization |  | 27,400 | 27,400 | 103,300 |
Payments to Acquire Property, Plant, and Equipment |  |  | 444,397 | 692,780 | $ 1,186,790
Cost to build, estimate | $ 3,000,000 |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 116,500 |
Depreciation expense |  |  | 475,900 | 437,600 | 344,400
Capital leases [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  | 39,600 |  |
Ag [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  | $ 146,139 | $ 260,865 | $ 417,950
Reserve and impairment charges [Member] | Ag [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 30,400 |  |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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