Segment Information - Long Lived Assets by Geographic Area (Detail) - USD ($) $ in Millions	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 174.9	$ 152.7	$ 148.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	119.2	117.6	117.9
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	16.4	13.9	12.2
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	22.6	18.9	16.8
Other Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 16.7	$ 2.3	$ 1.8