Investment in TS Kelly Asia Pacific (Details) - USD ($) $ in Millions		3 Months Ended				12 Months Ended
	Jul. 04, 2016	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 01, 2017	Jan. 03, 2016		Dec. 28, 2014
Schedule of Equity Method Investments [Line Items]
Investment in equity affiliate		$ 114.8				$ 114.8	$ 9.4
Gain on investment in TS Kelly Asia Pacific		0.0	$ 87.2	$ 0.0	$ 0.0	87.2	0.0	[1]	$ 0.0
Equity in net earnings (loss) of affiliate						1.1	(0.7)	[1]	(2.5)
Payments to acquire equity method investments						0.0	0.5	[1]	5.7
Accounts payable		455.1				455.1	405.5
TS Kelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Proceeds from investment in TS Kelly Asia Pacific equity affiliate	$ 36.5
Investment in equity affiliate	$ 104.2
Deconsolidated goodwill			1.9
Post-close cash true-up adjustment from Temp Holdings		4.5				4.5
Gain on investment in TS Kelly Asia Pacific			87.2
Tax expense on gain on investment in TS Kelly Asia Pacific equity affiliate			$ 23.5
Equity in net earnings (loss) of affiliate						1.1
Due to TS Kelly Asia Pacific		1.1				1.1
TS Kelly Workforce Solutions
Schedule of Equity Method Investments [Line Items]
Investment in equity affiliate							9.4
Payments to acquire equity method investments							$ 0.5		5.7
China-based Staffing Company
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments									$ 4.8
TS Kelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Accounts payable		$ 3.1				$ 3.1

[1] Fiscal year included 53 weeks.