Long-term Debt (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Long-term debt
Interest expense	$ 64,900	$ 46,900	$ 42,900
Non-cash interest expense	$ 6,180	$ 2,175	$ 5,841
Weighted average interest rate (as a percent)	5.20%	7.60%
Senior Secured Notes 7.625 Percent
Long-term debt
Interest expense	$ 21,300
Senior secured term loan, due March 2022
Long-term debt
Required quarterly repayments due	$ 1,100