Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Jan. 03, 2016		Dec. 28, 2014	Dec. 29, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains on available-for-sale investment, net of tax		$ 28.6	[1]	$ 11.5	$ 31.2
Asset impairments		0.0	[1]	0.0	$ 1.7
Impairment of goodwill		0.0		0.0
Temp Holdings Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains on available-for-sale investment, net of tax		28.6		11.5
Cost of available-for-sale investment		$ 17.2		$ 17.2
OCG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairments	$ 1.7

[1] Fiscal year included 53 weeks.