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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 17, 2012 | May 11, 2010 | Jan. 12, 2010 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2012 Minimum | Mar. 31, 2012 Minimum | Sep. 30, 2010 Minimum | Sep. 30, 2012 Maximum | Sep. 30, 2010 Maximum | Sep. 30, 2012 Senior Notes | Sep. 30, 2011 Senior Notes | Sep. 30, 2012 Convertible Subordinated Debt | Sep. 30, 2011 Convertible Subordinated Debt | Sep. 30, 2012 Tangible Equity Units Senior Notes TEUs | Jul. 17, 2012 Tangible Equity Units Senior Notes TEUs | Mar. 31, 2012 Tangible Equity Units Senior Notes TEUs | Sep. 30, 2010 Tangible Equity Units Senior Notes | May 31, 2010 Tangible Equity Units Senior Notes TEUs | May 11, 2010 Tangible Equity Units Senior Notes TEUs | Sep. 30, 2012 TEU Senior Amortizing Notes Maturing August 2013 [Member] Senior Notes | Sep. 30, 2011 TEU Senior Amortizing Notes Maturing August 2013 [Member] Senior Notes | Mar. 31, 2012 7 1/2% Mandatory Convertible Subordinated Notes [Member] Convertible Subordinated Debt | Sep. 30, 2012 7 1/2% Mandatory Convertible Subordinated Notes [Member] Convertible Subordinated Debt | Oct. 11, 2012 Repurchase of Equity | Jul. 17, 2012 Common Stock | May 11, 2010 Common Stock | Jan. 12, 2010 Common Stock | Mar. 31, 2012 Common Stock | Mar. 31, 2012 Common Stock | Sep. 30, 2012 Common Stock | Sep. 30, 2010 Common Stock
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized number of shares |  |  |  | 100,000,000 | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |
Shares of common stock exchanged for the 2010 TEUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  | 4,969,000 |
Tangible Equity Units (TEUs) issued during period (units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 4,600,000 | 2,800,000 |  | 3,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of original issuance of 2010 TEUs that were exchanged |  |  |  |  |  |  |  | 94.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizing notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 316,000 | $ 10,062,000 |  |  |  |  |  |  |  |  |  |
Number of common stock exchanged for debt (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |
Value of convertible debt exchanged for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,100,000 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 1,498,198,000 | 1,488,826,000 |  |  |  |  |  |  | 1,201,067,000 | 1,132,152,000 | 9,402,000 | 57,500,000 |  |  |  |  |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |
Number of shares in underwritten public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 | 2,500,000 | 4,485,000 |  |  | 4,400,000 | 6,985,000
Proceeds from issuance of TEU prepaid stock purchase contracts | 171,400,000 | 141,600,000 | 97,800,000 | 88,361,000 |  | 57,429,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid stock purchase contract settlement factor |  |  |  |  |  |  | 1.40746 |  | 0.70252 | 1.72414 | 0.86058 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid Stock Contract, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial fair value of prepaid stock purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock utilized in public offering of stock (shares) |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares surrendered by emloyees (shares) |  |  |  | 9,156 | 10,440 | 6,589 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of stock surrendered |  |  |  | $ 126,000 | $ 170,000 | $ 160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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