Share-Based Compensation - Expense Included in Selling, General and Administrative Expenses Related to Stock Options and Restricted Stock Awards (Detail) - Selling, General and Administrative Expenses - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 8.4	$ 11.5	$ 12.1
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	0.0	0.1	0.5
RSUs/PSUs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	7.4	10.3	10.7
RSAs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1.0	$ 1.1	$ 0.9