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Commitments and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Letters of Credit Outstanding, Amount | $ 13.0 | $ 15.3

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant