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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Letters of Credit Outstanding, Amount | $ 8.0 | $ 11.0
Purchase Obligation, Total | $ 6.3 |

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

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant