The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended		9 Months Ended
Commitments and Contingencies (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Letter of credit [Member]	Sep. 30, 2011 Letter of credit [Member]
Commitments and Contingencies (Textual) [Abstract]
Unused letters of credit, total					$ 1,580,000	$ 3,580,000
Commitments and Contingencies (Additional Textual) [Abstract]
Rental expense under operating leases with initial terms exceeding	$ 211,000	$ 179,000	$ 582,000	$ 538,000