Hedging Transactions and Derivative Financial Instruments - Notional Values of Derivative Instruments (Detail) (EUR €)	Sep. 30, 2012
Derivative [Line Items]
Notional Value of Copper Derivatives	125
Notional Amount of Foreign Currency Derivatives	€ 735,000,000

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant