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Union Contracts (Details) (Butler Works [Member])	Sep. 30, 2012 employees
Butler Works [Member]
Concentration Risk [Line Items]
Entity Number of Employees	1,250

X

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration