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Derivative Financial Instruments (Details 2) (USD $) |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
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Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2013 Interest rate swap agreements Cash flow hedges | Mar. 31, 2013 Derivatives designated as hedging instruments Foreign currency options Cash flow hedges | Mar. 31, 2013 Derivatives designated as hedging instruments Foreign currency options Cash flow hedges | Sep. 30, 2012 Derivatives designated as hedging instruments Foreign currency options Prepaid expenses and other current assets | Mar. 31, 2013 Derivatives designated as hedging instruments Foreign currency forward contracts Cash flow hedges | Mar. 31, 2013 Derivatives designated as hedging instruments Interest rate swap agreements Cash flow hedges | Mar. 31, 2012 Derivatives designated as hedging instruments Interest rate swap agreements Cash flow hedges | Mar. 31, 2013 Derivatives designated as hedging instruments Interest rate swap agreements Cash flow hedges | Mar. 31, 2012 Derivatives designated as hedging instruments Interest rate swap agreements Cash flow hedges | Mar. 31, 2013 Derivatives designated as hedging instruments Interest rate swap agreements Accrued expenses and other current liabilities | Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swap agreements Accrued expenses and other current liabilities | Mar. 31, 2013 Derivatives designated as hedging instruments Interest rate swap agreements Other long-term liabilities | Sep. 30, 2012 Derivatives designated as hedging instruments Interest rate swap agreements Other long-term liabilities | Mar. 31, 2013 Derivatives not designated as hedging instruments | Mar. 31, 2012 Derivatives not designated as hedging instruments | Mar. 31, 2013 Derivatives not designated as hedging instruments | Mar. 31, 2012 Derivatives not designated as hedging instruments | Mar. 31, 2013 Derivatives not designated as hedging instruments Option contracts Other income (expense) | Mar. 31, 2013 Derivatives not designated as hedging instruments Option contracts Other income (expense) | Mar. 31, 2013 Derivatives not designated as hedging instruments Option contracts Prepaid expenses and other current assets | Sep. 30, 2012 Derivatives not designated as hedging instruments Option contracts Prepaid expenses and other current assets | Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts General and administrative expenses | Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency forward contracts General and administrative expenses | Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts General and administrative expenses | Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency forward contracts General and administrative expenses | Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts Prepaid expenses and other current assets | Sep. 30, 2012 Derivatives not designated as hedging instruments Foreign currency forward contracts Prepaid expenses and other current assets | Mar. 31, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts Accrued expenses and other current liabilities | Sep. 30, 2012 Derivatives not designated as hedging instruments Foreign currency forward contracts Accrued expenses and other current liabilities
Fair values of outstanding derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ 1,400,000 | $ 600,000 |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 100,000 |  |  |  |  | $ 1,300,000 | $ 400,000 |  |
Derivative liabilities | 6,700,000 | 6,700,000 |  |  |  |  |  |  |  |  |  | 2,700,000 | 2,900,000 | 2,000,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 600,000
Effect of derivative instruments on income and other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Losses Recognized in Accumulated Other Comprehensive Loss on Derivatives Before Tax Effect (Effective Portion) |  |  | 4,700,000 |  |  |  |  |  | (2,100,000) |  | (2,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) |  |  |  | 0 |  |  |  | (800,000) | (500,000) | (1,500,000) | (900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion) |  |  |  |  | 100,000 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non designated derivatives, Gains/(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 | $ 1,200,000 | $ (300,000) | $ 2,700,000 | $ (300,000) | $ (400,000) |  |  | $ 1,100,000 | $ 1,200,000 | $ 100,000 | $ 2,700,000 |  |  |  |

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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 The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 4 -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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -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. + Details
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- Definition Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -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. + Details
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