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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
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Commitments and Contingencies Disclosure [Abstract] |  |
Purchase obligation | $ 7.6 | $ 12.1

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

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- 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