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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 3 Months Ended |  | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 17, 2012 | Sep. 30, 2014 offering | Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2014 TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2014 TEU Senior Amortizing Notes Maturing August 2015 Senior Notes | Sep. 30, 2013 TEU Senior Amortizing Notes Maturing August 2015 Senior Notes | Sep. 30, 2014 Tangible Equity Units Senior Notes | Jul. 17, 2012 Tangible Equity Units Senior Notes TEUs | Mar. 31, 2012 Tangible Equity Units Senior Notes TEUs | Sep. 30, 2014 7.5% Senior Amortizing Note Maturing July 15, 2015 | Mar. 31, 2012 7 1/2% Mandatory Convertible Subordinated Notes Convertible Subordinated Debt | Sep. 30, 2014 7 1/2% Mandatory Convertible Subordinated Notes Convertible Subordinated Debt | Jul. 17, 2012 Common Stock | Sep. 30, 2014 Common Stock | Mar. 31, 2013 Common Stock | Mar. 31, 2012 Common Stock | Sep. 30, 2014 Common Stock | Sep. 30, 2013 Common Stock | Sep. 30, 2014 Range 1 TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2014 Range 2 TEU Senior Amortizing Notes Maturing August 2015 | Sep. 30, 2014 Range 3 TEU Senior Amortizing Notes Maturing August 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized number of shares |  | 63,000,000 | 63,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Instrument Convertible Number of Equity Instruments |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock exchanged for the 2010 TEUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 156,975 |  |  |  | 2,800,000 |  |  |
Tangible Equity Units (TEUs) issued during period (units) |  |  |  |  |  |  |  |  |  | 4,600,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  |  |  |  |  | 7.50% |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Percentage of original issuance of 2010 TEUs that were exchanged |  |  |  |  | 94.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizing notes outstanding |  |  |  |  |  |  | $ 6,703,000 | $ 16,141,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock exchanged for debt (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 408,790 | 2,200,000 |  |  |  |  |
Value of convertible debt exchanged for common stock |  |  |  |  |  |  |  |  |  |  |  |  | 48,100,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |
Number of shares in underwritten public offering (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |  |  |  |  |
Proceeds from issuance of TEU prepaid stock purchase contracts | 171,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offerings |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares surrendered by emloyees (shares) |  | 23,602 | 6,147 | 9,156 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of stock surrendered |  | $ 450,000 | $ 121,000 | $ 126,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
382 Ownership Limitation |  | 4.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,368,108 |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  | 1.5372 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.72414 | 1.40746 | 25.00
Tangible Equity Units TEUs Converted |  |  |  |  |  |  |  |  | 890,000 |  |  |  |  |  |  |  |  |  |  |  | 115,433 | 1,252,675 |
Debt Instrument, Convertible, Stock Price Trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.50 | $ 17.75 |
Debt Instrument, Convertible, Number of Equity Instruments |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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