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Financial Instruments (Details) (USD $) |  |  |  | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2007 | Mar. 31, 2011 Interest Rate Cap [Member] | Dec. 31, 2010 Interest Rate Cap [Member] | Dec. 31, 2010 Interest Rate Swaps [Member] | Dec. 31, 2007 Interest Rate Swaps [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap From December 2011 To December 2012 [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap From December 2012 To December 2013 [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap [Member] | Mar. 31, 2011 Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2011 1.91% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2011 2.50% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2011 1.96% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2011 1.32% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2010 2.38% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2007 4.76% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2007 4.87% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2011 Other Current Liabilities [Member] | Dec. 31, 2010 Other Current Liabilities [Member] | Dec. 31, 2011 Other Noncurrent Liabilities [Member] | Dec. 31, 2010 Other Noncurrent Liabilities [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate swaps |  |  | 2 |  | 3 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total notional amount of interest rate cash flow hedges |  |  |  | $ 275,000,000 | $ 1,000,000,000 |  | $ 150,000,000 | $ 450,000,000 | $ 400,000,000 |  | $ 425,000,000 | $ 225,000,000 | $ 100,000,000 | $ 25,000,000 | $ 75,000,000 | $ 600,000,000 | $ 75,000,000 |  |  |  |  |
Interest rate percentage above which counterparty agrees to pay the difference |  |  |  | 2.25% | 2.25% |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Premium paid on interest rate cap |  |  |  | 30,000 | 240,000 |  |  |  |  | 740,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of interest rate cash flow hedges |  |  |  | Dec. 01, 2011 | Dec. 01, 2011 |  |  |  |  |  |  | May 01, 2015 | Dec. 01, 2014 | Dec. 01, 2013 | Dec. 01, 2012 | May 01, 2015 | Oct. 01, 2012 | Oct. 01, 2011 |  |  |  |
Number of additional forward starting interest rate swaps |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |
Fixed rate payable on interest rate swap |  |  |  |  |  |  |  |  |  |  |  | 1.91% | 2.50% | 1.96% | 1.32% | 2.38% | 4.76% | 4.87% |  |  |  |
Reduction in the notional amount of interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Fair value of our interest rate swaps, liability | $ 48,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 | $ 2,000,000 | $ 44,000,000 | $ 8,000,000

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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments. Recognized in earnings and offsets the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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