Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Carlyle
Related party transactions
Expected annual consulting fee	$ 3,000
Expenses incurred from transactions with related party	3,000
Out of pocket expenditures paid to related party	1,927	$ 915	$ 311
Vendor affiliated with Carlyle
Related party transactions
Expenses incurred from transactions with related party	$ 5,398	$ 391	$ 139