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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  | 0 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Jul. 17, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2013 Minimum | Mar. 31, 2012 Minimum | Sep. 30, 2013 Maximum | Sep. 30, 2013 Convertible Subordinated Debt | Sep. 30, 2012 Convertible Subordinated Debt | Sep. 30, 2013 Tangible Equity Units Senior Notes | Jul. 17, 2012 Tangible Equity Units Senior Notes TEUs | Mar. 31, 2012 Tangible Equity Units Senior Notes TEUs | May 31, 2010 Tangible Equity Units Senior Notes TEUs | Sep. 30, 2013 TEU Senior Amortizing Notes Maturing August 2013 [Member] Senior Notes | Sep. 30, 2012 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, 2013 7 1/2% Mandatory Convertible Subordinated Notes [Member] Convertible Subordinated Debt | Jul. 17, 2012 Common Stock | Sep. 30, 2013 Common Stock | Sep. 30, 2012 Common Stock | Mar. 31, 2013 Common Stock | Mar. 31, 2012 Common Stock | Sep. 30, 2013 Common Stock | Sep. 30, 2012 Common Stock | Sep. 30, 2012 Pre-adjustment shares [Member] | Sep. 30, 2013 Post-adjustment Shares [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized number of shares |  | 63,000,000 | 63,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 63,000,000
Shares of common stock exchanged for the 2010 TEUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 156,975 | 2,800,000 |  |  | 566,000 | 4,969,000 |  |
Tangible Equity Units (TEUs) issued during period (units) |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 2,800,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of original issuance of 2010 TEUs that were exchanged |  |  |  |  |  | 94.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizing notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 316,000 |  |  |  |  |  |  |  |  |  |  |
Number of common stock exchanged for debt (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 408,790 | 2,200,000 | 400,000 |  |  |
Value of convertible debt exchanged for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,100,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | 0 | 9,402,000 |  |  |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |
Number of shares in underwritten public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |  | 0 | 4,400,000 |  |
Proceeds from issuance of TEU prepaid stock purchase contracts | 171,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid stock purchase contract settlement factor |  |  |  |  | 1.40746 |  | 1.72414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial fair value of prepaid stock purchase contracts |  |  |  |  |  |  |  |  |  | 88,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares surrendered by emloyees (shares) |  | 6,147 | 9,156 | 10,440 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of stock surrendered |  | $ 121,000 | $ 126,000 | $ 170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
382 Ownership Limitation |  | 4.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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