401(k) and Profit Sharing Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
401(k) and Profit Sharing Plan
Defined contribution plan, expense recognized	$ 6.4	$ 6.7	$ 6.2
Profit sharing plan, expense recognized	$ 3.2	$ 3.2	$ 3.3