Cash outflows made during the period for environmental remediation activities.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 17

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3367-108585

Name:	us-gaap_PaymentsForEnvironmentalLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Environmental and Legal Matters (Details) (Shipment of Engines and Catalytic Converters Separately, USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 31, 2012	Sep. 30, 2011	Jul. 31, 2011	Jul. 31, 2010
Environmental Contingency, Penalties and Information
Civil penalty demanded as issued by the Department of Justice	$ 2.55	$ 2.55	$ 2.55	$ 3.20
California Air Resources Board
Environmental Contingency, Penalties and Information
Payments for Environmental Liabilities	0.51
United States Government
Environmental Contingency, Penalties and Information
Payments for Environmental Liabilities		$ 2.04