Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-term Debt (Details) (USD $)	Mar. 31, 2015	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2011
Long-term debt
Debt instrument, face amount	$ 575,000,000us-gaap_DebtInstrumentFaceAmount	$ 599,800,000us-gaap_DebtInstrumentFaceAmount
Carrying amount of long-term debt, net of discounts and debt issue costs	562,317,000us-gaap_LongTermDebt	592,458,000us-gaap_LongTermDebt
Less current portion	(3,188,000)us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Long-term debt	559,129,000us-gaap_LongTermDebtNoncurrent	592,458,000us-gaap_LongTermDebtNoncurrent
Senior secured term loan, due March 2022
Long-term debt
Debt instrument, face amount	425,000,000
Carrying amount of long-term debt, net of discounts and debt issue costs	414,801,000	0
7.25% Senior notes, due January 2019
Long-term debt
Debt instrument, face amount	150,000,000	150,000,000	150,000,000
Carrying amount of long-term debt, net of discounts and debt issue costs	147,516,000	147,192,000
Interest rate on long-term debt (as a percent)	7.25%	7.25%	7.25%
Senior Secured Notes 7.625 Percent
Long-term debt
Debt instrument, face amount		400,000,000		400,000,000
Carrying amount of long-term debt, net of discounts and debt issue costs	0	396,058,000
Interest rate on long-term debt (as a percent)	7.625%	7.625%		7.625%
Convertible Senior Subordinated Notes 8.75 Percent Due 2016
Long-term debt
Debt instrument, face amount		49,791,000
Carrying amount of long-term debt, net of discounts and debt issue costs	$ 0	$ 49,208,000
Interest rate on long-term debt (as a percent)	8.75%	8.75%