Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jan. 03, 2016	[1]	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Revenue from services	$ 5,518.2		$ 5,562.7	$ 5,413.1
Cost of services	4,597.9		4,654.3	4,523.6
Gross profit	920.3		908.4	889.5
Selling, general and administrative expenses	853.6		886.5	834.5
Asset impairments	0.0		0.0	1.7
Earnings from operations	66.7		21.9	53.3
Other expense, net	4.2		5.3	4.5
Earnings from operations before taxes	62.5		16.6	48.8
Income tax expense (benefit)	8.7		(7.1)	(10.1)
Net earnings	$ 53.8		$ 23.7	$ 58.9
Basic earnings per share (in dollars per share)	$ 1.39		$ 0.61	$ 1.54
Diluted earnings per share (in dollars per share)	1.39		0.61	1.54
Dividends per share (in dollars per share)	$ 0.20		$ 0.20	$ 0.20
Average shares outstanding (millions):
Basic (in shares)	37.8		37.5	37.3
Diluted (in shares)	37.9		37.5	37.3

[1] Fiscal year included 53 weeks.