Derivative Instruments - Derivative Narrative (Details) (Interest Rate Swap [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012 Not Designated as Hedging Instrument [Member]	Sep. 30, 2013 Senior Secured Term Loan A [Member] Cash Flow Hedging [Member] October 2017 Maturity [Member]	Sep. 30, 2013 Senior Secured Term Loan B [Member] Cash Flow Hedging [Member] October 2019 Maturity [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 100.0	$ 175.0	$ 150.0
Derivative, Fixed Interest Rate	1.80%	0.74%	2.05%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant