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Borrowings - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) lender | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) lender | Mar. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jan. 15, 2010 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |
Amount of available borrowings under the Secured Revolving Credit Facility | $ 116,100,000 |  | $ 116,100,000 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Loss on extinguishment of debt | 1,631,000 | $ 0 | 2,459,000 | $ 0 |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | 5,272,000 |  | 5,272,000 |  | $ 3,639,000 |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | 1,459,605,000 |  | 1,459,605,000 |  | 1,528,275,000 |
Senior Notes |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | 3,259,000 |  | 3,259,000 |  | 3,639,000 |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | 1,246,309,000 |  | $ 1,246,309,000 |  | $ 1,427,240,000 |
Senior Notes | 8 1/8% Senior Notes Maturing June 2016 |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes | $ 600,000 |  |  |  |  |
Stated interest rate on debt instrument (percent) | 8.125% |  | 8.125% |  | 8.125% |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | $ 0 |  | $ 0 |  | $ 170,879,000 |
Senior Notes | 6 5/8% Senior Secured Notes April 2018 |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 6.625% |  | 6.625% |  | 6.625% |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | $ 300,000,000 |  | $ 300,000,000 |  | $ 300,000,000 |
Senior Notes | 9 1/8% Senior Notes Maturing May 2019 |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes | $ 9,800,000 |  |  |  |  |
Stated interest rate on debt instrument (percent) | 9.125% |  | 9.125% |  | 9.125% |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | $ 225,175,000 |  | $ 225,175,000 |  | $ 235,000,000 |
Term Loan |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Minimum Inventory Required | 1,250,000,000 |  | 1,250,000,000 |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |
Aggregate principal amount of debt | $ 140,000,000 |  | 140,000,000 |  |  |
Debt Instrument, Term | 2 years |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | $ 17,500,000 |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |
Unamortized accretion | 2,013,000 |  | 2,013,000 |  |  |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | $ 137,987,000 |  | $ 137,987,000 |  | 0 |
Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 55000.00% |  | 55000.00% |  |  |
Junior Subordinated Notes |  |  |  |  |  |
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 | 41,900,000 |  | $ 41,900,000 |  | 43,000,000 |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | 58,837,000 |  | 58,837,000 |  | 57,803,000 |
Cash Secured Loan |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | 0 |  | 0 |  | 22,368,000 |
Other Secured Notes Payable |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |
Notes Payable | $ 16,472,000 |  | $ 16,472,000 |  | 20,864,000 |
Weighted average fixed interest rate of debt (percent) | 4.51% |  | 4.51% |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Credit facility borrowing capacity | $ 145,000,000 |  | $ 145,000,000 |  | 130,000,000 |
Inventory assets pledged as collateral | 1,000,000,000 |  | 1,000,000,000 |  |  |
Letters of credit secured using cash collateral | 28,900,000 |  | 28,900,000 |  |  |
Long-term Line of Credit | 0 |  | 0 |  | 0 |
Letter of Credit, Cash Secured |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Letters of credit secured using cash collateral | $ 14,300,000 |  | $ 14,300,000 |  | $ 14,400,000 |
Number of Lenders Extending Credit Facility |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Line of Credit Facility, Number of Lenders | lender | 3 |  | 3 |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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