FAIR VALUE - DEBT (Details) (USD $)	Mar. 31, 2015		Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases	$ 52,600,000		$ 49,900,000
Level 2 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	682,845,000	[1]	557,845,000	[1]
Level 2 [Member] | Fair Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 728,283,000		$ 586,909,000

[1] Excludes capital leases of $52.6 million and $49.9 million as of March 31, 2015 and September 30, 2014, respectively.