Business Segments and Geographic Information - Schedule of Geographically Located Property and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Geographic Information For Property Plant And Equipment [Line Items]
Property, plant and equipment, net	$ 491.2	$ 460.2	$ 457.1
United States
Geographic Information For Property Plant And Equipment [Line Items]
Property, plant and equipment, net	386.5	370.7	369.1
Costa Rica
Geographic Information For Property Plant And Equipment [Line Items]
Property, plant and equipment, net	30.1	28.1	27.7
Europe
Geographic Information For Property Plant And Equipment [Line Items]
Property, plant and equipment, net	57.1	49.2	50.8
Rest of world
Geographic Information For Property Plant And Equipment [Line Items]
Property, plant and equipment, net	$ 17.5	$ 12.2	$ 9.5