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Borrowings - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) lender | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) lender | Mar. 31, 2016 USD ($) | Jul. 30, 2016 | Jan. 31, 2010 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Amount of available borrowings under the Secured Revolving Credit Facility | $ 140,700,000 | $ 106,800,000 |  | $ 140,700,000 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Loss on extinguishment of debt | 15,563,000 |  | $ 1,631,000 | 15,563,000 | $ 2,459,000 |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | 1,334,362,000 | 1,331,878,000 |  | 1,334,362,000 |  |  |
5 3/4% Senior Notes Maturing June 2019 |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | 321,393,000 |  |  | 321,393,000 |  |  |
Senior Notes |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | $ 1,258,548,000 | $ 1,207,526,000 |  | $ 1,258,548,000 |  |  |
Senior Notes | 6 3/4% Senior Notes Maturing March 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percentage of Debt Outstanding after Repurchase | 35.00% |  |  | 35.00% |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 6.75% | 6.75% |  | 6.75% |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 6.75% | 6.75% |  | 6.75% |  |  |
Aggregate principal amount of debt | $ 250,000,000 |  |  | $ 250,000,000 |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | $ 250,000,000 | $ 0 |  | $ 250,000,000 |  |  |
Debt Instrument, Repurchase Price upon Change of Control, Percent of Par | 101.00% |  |  | 101.00% |  |  |
Senior Notes | 9 1/8% Senior Notes Maturing May 2019 [Member] |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes |  |  | 9,800,000 |  |  |  |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes |  |  | $ 600,000 |  |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 5.75% | 5.75% |  | 5.75% |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 5.75% | 5.75% |  | 5.75% |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net |  | $ 321,393,000 |  |  |  |  |
Term Loan |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Call price and make-whole premiums provided for by 2018 Notes | $ 55,000,000 |  |  |  |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt instrument term | 2 years |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Aggregate principal amount of debt | $ 140,000,000 |  |  | $ 140,000,000 |  |  |
Unamortized accretion | 0 | 800,000 |  | 0 |  |  |
Debt Issuance Costs, Net | 0 | 1,451,000 |  | 0 |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | 0 | $ 52,669,000 |  | 0 |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |
Other Long-term Debt [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  |  |  |  |  | 7.987% |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  |  |  |  |  | 7.987% |
Effective period of debt instrument interest rate |  | 10 years |  |  |  |  |
Debt Instrument, Face Amount Modification |  |  |  |  |  |  | $ 75,000,000
Unamortized accretion | 39,870,000 | $ 40,903,000 |  | 39,870,000 |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | $ 60,903,000 | 59,870,000 |  | $ 60,903,000 |  |  |
Weighted average fixed interest rate of debt (percent) | 4.25% |  |  | 4.25% |  |  |
Other secured notes payable |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |
Total debt, net | $ 14,911,000 | 11,813,000 |  | $ 14,911,000 |  |  |
Weighted average fixed interest rate of debt (percent) | 3.32% |  |  | 3.32% |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 180,000,000 | 145,000,000 |  | $ 180,000,000 |  |  |
Inventory assets pledged as collateral | $ 800,000,000 | 1,000,000,000 |  | $ 800,000,000 |  |  |
Number of lenders | lender | 3 |  |  | 3 |  |  |
Borrowings outstanding under facility | $ 0 | 0 |  | $ 0 |  |  |
Letters of credit secured using cash collateral | $ 39,300,000 | $ 38,200,000 |  | $ 39,300,000 |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Aggregate collateral ratio | 4.00 | 5.00 |  | 4.00 |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Aggregate collateral ratio | 1.00 | 1.00 |  | 1.00 |  |  |
Letter of Credit, Cash Secured |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |
Letters of credit secured using cash collateral | $ 13,100,000 | $ 12,100,000 |  | $ 13,100,000 |  |  |
Optional Redemption Under Indenture | Senior Notes | 6 3/4% Senior Notes Maturing March 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percentage of Debt Outstanding after Repurchase | 65.00% |  |  | 65.00% |  |  |
Debt Instrument, Redemption Option, Percent of Par | 106.75% |  |  | 106.75% |  |  |

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