Segment Disclosures - Summary of Revenue From Services by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 03, 2016	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Jan. 03, 2016		Dec. 28, 2014	Dec. 29, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services	$ 1,461.6	$ 1,351.0	$ 1,385.0	$ 1,320.6	$ 1,425.0	$ 1,396.4	$ 1,410.5	$ 1,330.8	$ 5,518.2	[1]	$ 5,562.7	$ 5,413.1
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									3,705.2		3,535.8	3,419.9
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									$ 1,813.0		$ 2,026.9	$ 1,993.2

[1] Fiscal year included 53 weeks.