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Segment Disclosures - Segment Revenue Per Service (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Revenue from Services:
Revenue from services	$ 1,414.7	$ 1,342.4	$ 1,386.9	$ 1,369.9	$ 1,422.3	$ 1,328.8	$ 1,333.6	$ 1,289.7	$ 5,513.9	$ 5,374.4
Service
Revenue from Services:
Revenue from services									5,513.9	5,374.4	$ 5,276.8
Service | Reporting Segments | Americas Staffing
Revenue from Services:
Revenue from services									2,417.7	2,345.9	2,191.6
Service | Reporting Segments | GTS
Revenue from Services:
Revenue from services									1,997.4	1,998.9	1,977.1
Service | Reporting Segments | International Staffing
Revenue from Services:
Revenue from services									1,116.6	1,048.2	1,127.1
Service | Less: Intersegment revenue
Revenue from Services:
Revenue from services									$ (17.8)	$ (18.6)	$ (19.0)

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Publisher FASB
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