FAIR VALUE - DEBT (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases		$ 50,700	$ 49,900
Level 2 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	[1]	832,845	557,845
Level 2 [Member] | Fair Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		$ 839,710	$ 586,909

[1] Excludes capital leases of $50.7 million and $49.9 million as of June 30, 2015 and September 30, 2014, respectively.