Long-term Debt (Details 5) (USD $)	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Long-term Debt
Interest expense	$ 46,900,000	$ 42,900,000	$ 53,400,000
Non-cash interest expense	$ 2,175,000	$ 5,841,000	$ 14,184,000
Weighted average interest rate (as a percent)	7.60%	7.70%

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_AmortizationOfFinancingCostsAndDiscounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration