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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
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Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | $ 200,667 | $ 52,335
Total liability derivatives | 1,551,733 | 1,400,568
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 3,196 | 3,463
Total liability derivatives | 3,072 | 5,884
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 985 | 274
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Deferred charges and other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 1,017 |
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 9 | 1,228
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives |  | 4
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 1,194 | 3,189
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Accounts payable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 3,063 | 2,698
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member] | Accounts payable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives |  | 1,246
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member] | Accrued and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives |  | 708
Derivatives not designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 3,237 | 3,463
Total liability derivatives | 241,915 | 104,215
Derivatives not designated as hedging instruments [Member] | Equity conversion feature of preferred stock [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 231,950 | 75,350
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 41 |
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Accounts payable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 3,967 | 10,945
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | $ 2,926 | $ 12,036

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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