Debt - Debt Acquired in Acquisition (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 16, 2008	Dec. 25, 2016	Dec. 27, 2015
Debt Instrument [Line Items]
Carrying amount		$ 432.0	$ 445.1
10-year term loan
Debt Instrument [Line Items]
Maturity period (in years)	10 years
Carrying amount		1.8	$ 2.7
Quarterly installment payment - principal		$ 0.3
Basis spread on variable rate (percent)			1.50%