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Borrowings - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) lender | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) lender | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jan. 31, 2010 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 1,429,483,000 |  | $ 1,429,483,000 |  | $ 1,528,275,000 |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Amount of available borrowings under the Secured Revolving Credit Facility | 115,100,000 |  | 115,100,000 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Loss on extinguishment of debt | (429,000) | $ 0 | 2,030,000 | $ 0 |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | 4,819,000 |  | 4,819,000 |  | 3,639,000 |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | 1,429,483,000 |  | 1,429,483,000 |  | 1,528,275,000 |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | 1,234,249,000 |  | 1,234,249,000 |  | 1,427,240,000 |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | 3,069,000 |  | 3,069,000 |  | 3,639,000 |
Senior Notes | 9 1/8% Senior Notes Maturing May 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | 215,925,000 |  | 215,925,000 |  | $ 235,000,000 |
Senior Notes [Abstract] |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes | $ 9,300,000 |  | $ 19,100,000 |  |  |
Stated interest rate on debt instrument (percent) | 9.125% |  | 9.125% |  | 9.125% |
Senior Notes | 8 1/8% Senior Notes Maturing June 2016 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 0 |  | $ 0 |  | $ 170,879,000 |
Senior Notes [Abstract] |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes | $ 3,000,000 |  | $ 3,600,000 |  |  |
Stated interest rate on debt instrument (percent) | 8.125% |  | 8.125% |  | 8.125% |
Senior Notes | 6 5/8% Senior Secured Notes April 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 300,000,000 |  | $ 300,000,000 |  | $ 300,000,000 |
Senior Notes [Abstract] |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 6.625% |  | 6.625% |  | 6.625% |
Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 120,750,000 |  | $ 120,750,000 |  | $ 0 |
Senior Notes [Abstract] |  |  |  |  |  |
Minimum inventory required | 1,250,000,000.00 |  | 1,250,000,000.00 |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |
Aggregate principal amount of debt | $ 140,000,000 |  | 140,000,000 |  |  |
Debt instrument term | 2 years |  |  |  |  |
Principal payment |  |  | 17,500,000 |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | $ 1,750,000 |  | $ 1,750,000 |  |  |
Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 55000.00% |  | 55000.00% |  |  |
Junior Subordinated Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 59,353,000 |  | $ 59,353,000 |  | 57,803,000 |
Senior Notes [Abstract] |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 7.987% |  | 7.987% |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |
Aggregate principal amount of debt | $ 103,100,000 |  | $ 103,100,000 |  |  | $ 75,000,000
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Effective period of debt instrument interest rate |  |  | 10 years |  |  |
Unamortized accretion | 41,420,000 |  | $ 41,420,000 |  | 42,970,000 |
Other secured notes payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 15,131,000 |  | $ 15,131,000 |  | 20,864,000 |
Secured Debt [Abstract] |  |  |  |  |  |
Weighted average fixed interest rate of debt (percent) | 3.27% |  | 3.27% |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Credit facility borrowing capacity | $ 145,000,000 |  | $ 145,000,000 |  | 130,000,000 |
Borrowings outstanding under facility | 0 |  | 0 |  | 0 |
Inventory assets pledged as collateral | 1,000,000,000 |  | 1,000,000,000 |  |  |
Letters of credit secured using cash collateral | $ 29,900,000 |  | $ 29,900,000 |  |  |
Number of Lenders Extending Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Number of lenders | lender | 3 |  | 3 |  |  |
Letter of Credit, Cash Secured |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Letters of credit secured using cash collateral | $ 15,600,000 |  | $ 15,600,000 |  | $ 14,400,000 |

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