Amount borrowed under the credit facility as of the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of the required periodic payment applied to principal.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

Debt Including Capital Lease Obligations - Credit Facility Narrative (Details) (USD $)									1 Months Ended	0 Months Ended
	Feb. 05, 2013 Credit Facility Revolver	Dec. 31, 2012 Credit Facility Revolver	Sep. 30, 2012 Credit Facility Revolver	Feb. 05, 2013 Credit Facility Term Loan	Dec. 31, 2012 Credit Facility Term Loan	Sep. 30, 2012 Credit Facility Term Loan	Dec. 31, 2012 Letter of Credit	Sep. 30, 2012 Letter of Credit	Feb. 28, 2013 Through June 30, 2013 Credit Facility Term Loan	Feb. 05, 2013 Beginning September 30, 2013 through March 31, 2016 Credit Facility Term Loan
Line of Credit Facility [Line Items]
Revolver maximum borrowing capacity	$ 150,000,000			$ 330,000,000
Quarterly principal payment of Term Loan									4,000,000	8,000,000
Interest rate on Credit Facility Term Loan		5.00%	5.00%		5.00%	5.00%
Credit Facility amount outstanding		40,000,000	20,000,000				22,000,000	21,000,000
Revolver remaining borrowing capacity		$ 88,000,000	$ 109,000,000