401(k) and Profit Sharing Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
401(k) and Profit Sharing Plan
Defined contribution plan, expense recognized	$ 7.1	$ 6.8	$ 6.4
Profit sharing plan, expense recognized	$ 2.6	$ 3.3	$ 3.2