Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Identifiable Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2.1
Customer Relationships [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	19 years 5 months 16 days
Deferred Financing Costs [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 11 months 16 days