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Commitments And Contingencies (Details) (USD $) In Millions | Sep. 30, 2011 | Sep. 30, 2010
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Commitments And Contingencies [Abstract] |  |
Outstanding letters of credit | $ 15.0 | $ 13.0

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant