Concentration of Credit Risk (Narrative) (Detail)	12 Months Ended
Sep. 30, 2012 No Customer Of Concentration Risk [Member]	Sep. 30, 2011 No Customer Of Concentration Risk [Member]	Sep. 30, 2010 Goodyear Tire And Rubber Company [Member]
Concentration of risk percentage	10.00%	10.00%
Net sales percentage			12.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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

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-Name Accounting Standards Codification

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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