Schedule of Other Expense Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Components of Other Income (Expense) [Line Items]
Interest expense	$ 1.3	$ 1.5	$ 2.8	$ 2.8
Interest income	(0.2)	(0.1)	(0.4)	(0.3)
Other, net	0.1	0.2	0.4	0.3
Other expense, net	$ 1.2	$ 1.6	$ 2.8	$ 2.8