401(k) and Profit Sharing Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
401(k) and Profit Sharing Plan
Defined contribution plan, expense recognized	$ 6.8	$ 6.4	$ 6.7
Profit sharing plan, expense recognized	$ 3.3	$ 3.2	$ 3.2