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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reconciliation of total capital expenditures incurred to total capital expenditures in the consolidated statements of cash flows |  |
Capital expenditures incurred | $ 190,965 | $ 191,804
Additions incurred in prior year but paid for in current period | 20,004 | 9,465
Additions incurred but not paid for as of the end of the period | (19,767) | (25,966)
Capital expenditures per Consolidated Condensed Statements of Cash Flows | $ 191,202 | $ 175,303

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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