FAIR VALUE - DEBT (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Sep. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases		$ 51,300	$ 46,900
Level 2 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	[1]	807,845	807,845
Level 2 [Member] | Fair Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		$ 809,107	$ 817,319

[1] Excludes capital leases of $51.3 million and $46.9 million as of December 31, 2015 and September 30, 2015, respectively.