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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Related party transactions
Debt issued	$ 2,107,931us-gaap_LongTermDebt		$ 2,107,931us-gaap_LongTermDebt		$ 2,099,748us-gaap_LongTermDebt
Holdings \| Holdco Notes
Related party transactions
Debt issued	1,000,000		1,000,000
Carlyle
Related party transactions
Expected annual consulting fee			3,000
Expenses incurred from transactions with related party	750	750	1,500	1,500
Out of pocket expenditures paid to related party	$ 54	$ 39	$ 388	$ 368

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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