Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	[1]	Dec. 28, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 120.8	$ 53.8		$ 23.7
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net of tax benefit of $0.9 million, tax expense of $0.4 million and $0.6 million, respectively	(0.6)	(19.4)		(20.2)
Less: Reclassification adjustments included in net earnings	(0.1)	(0.2)		(0.9)
Foreign currency translation adjustments	(0.7)	(19.6)		(21.1)
Unrealized gains (losses) on investment, net of tax benefit of $0.7 million and tax expense of $15.8 million and $8.2 million, respectively	(1.1)	28.6		11.5
Pension liability adjustments, net of tax expense of $0.0 million, $0.0 million and $0.0 million, respectively	(0.3)	0.5		(0.8)
Less: Reclassification adjustments included in net earnings	0.1	0.1		0.1
Pension liability adjustments	(0.2)	0.6		(0.7)
Other comprehensive income (loss)	(2.0)	9.6		(10.3)
Comprehensive Income	$ 118.8	$ 63.4		$ 13.4

[1] Fiscal year included 53 weeks.