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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

X

- 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

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+ References

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