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SEGMENT INFORMATION (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment information
Operating revenues	$ 566,110	$ 659,694	$ 883,052	$ 1,056,585	$ 985,038	$ 952,087	$ 893,430	$ 889,152	$ 3,165,441	$ 3,719,707	$ 3,387,614
Long-Lived Assets	5,567,235				5,188,544				5,567,235	5,188,544	$ 4,676,103
Accounts receivable, net of reserve	449,344				705,214				$ 449,344	$ 705,214
Operating revenues | Customer concentration | Customer one
Segment information
Concentration percentage									10.60%	7.30%	10.80%
Operating revenues | Customer concentration | Customer two
Segment information
Concentration percentage									9.80%	10.70%	9.50%
Receivables | Customer concentration
Segment information
Accounts receivable, net of reserve	116,900				121,400				$ 116,900	$ 121,400
United States
Segment information
Operating revenues									2,750,043	3,338,365	$ 3,011,760
Long-Lived Assets	5,149,315				4,753,844				5,149,315	4,753,844	4,345,950
Argentina
Segment information
Operating revenues									169,359	107,945	73,208
Long-Lived Assets	213,938				144,823				213,938	144,823	83,149
Colombia
Segment information
Operating revenues									74,339	85,176	100,052
Long-Lived Assets	103,316				107,112				103,316	107,112	81,315
Ecuador
Segment information
Operating revenues									34,211	69,195	67,890
Long-Lived Assets	29,142				70,742				29,142	70,742	63,894
Other foreign
Segment information
Operating revenues									137,489	119,026	134,704
Long-Lived Assets	$ 71,524				$ 112,023				$ 71,524	$ 112,023	$ 101,795

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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