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Segment Information - Revenue from external customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Segment information |  |  |  |
Operating revenues | $ 577,484 | $ 405,283 | $ 1,141,571 | $ 773,873
United States |  |  |  |
Segment information |  |  |  |
Operating revenues | 524,435 | 370,526 | 1,025,193 | 671,085
Argentina |  |  |  |
Segment information |  |  |  |
Operating revenues | 49,800 | 23,267 | 98,629 | 71,349
Colombia |  |  |  |
Segment information |  |  |  |
Operating revenues | 237 | 8,852 | 12,233 | 18,223
Other Foreign |  |  |  |
Segment information |  |  |  |
Operating revenues | $ 3,012 | $ 2,638 | $ 5,516 | $ 13,216

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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