Significant Accounting Policies (Details 4) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Revenue Recognition
Sales returns and allowance, average of net sales (as a percent)	2.00%	2.00%	2.00%
Shipping and Handling
Shipping and handling costs	$ 53.1	$ 52.2	$ 48.5
Advertising Costs
Advertising costs	$ 95.3	$ 90.2	$ 83.9