Inventories (Components of Inventory) (Details) - USD ($) $ in Millions	Dec. 27, 2015	Sep. 27, 2015	Dec. 28, 2014
Inventory Disclosure [Abstract]
Unroasted coffee	$ 559.2	$ 529.4	$ 414.2
Roasted coffee	256.6	279.7	227.2
Other merchandise held for sale	270.8	318.3	230.2
Packaging and other supplies	156.0	179.0	146.7
Total	$ 1,242.6	$ 1,306.4	$ 1,018.3