Commitments And Contingencies, And Derivative Financial Instruments (Significant Terms Of The Lease) (Details) (USD $) In Thousands	12 Months Ended
Sep. 30, 2011
Commitments And Contingencies, And Derivative Financial Instruments
End of lease term	2015
End of term purchase option	$ 52,200
Residual value guaranty	$ 38,800

The estimate of the value of the leased asset at the end of the lease term.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 30

-Paragraph 14

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6791857&loc=d3e42840-112730

Name:	us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant