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Segment Information - Revenue from external customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment information
Operating revenues	$ 648,872	$ 498,564	$ 1,790,443	$ 1,272,437
United States
Segment information
Operating revenues	585,126	443,489	1,610,319	1,114,574
Argentina
Segment information
Operating revenues	50,272	43,167	148,901	114,516
Colombia
Segment information
Operating revenues	10,639	9,356	22,872	27,579
Other Foreign
Segment information
Operating revenues	$ 2,835	$ 2,552	$ 8,351	$ 15,768

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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