Risk Management - Additional Information (Detail) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 25, 2016 USD ($)	Dec. 27, 2015 USD ($)	May 30, 2017
Trading Activity, Gains and Losses, Net [Line Items]
Foreign currency exchange rate percentage	0.051	0.051			3.74193
Foreign currency transaction gain (loss), before tax		$ 12.9	$ 0.4	$ 1.2
Fair value asset relating to foreign contracts for aluminum	$ 1.8	1.8
Forward Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Foreign currency transaction gain (loss), before tax		8.2
Swap [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Foreign currency transaction gain (loss), before tax		2.5
Mexico [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Cumulative unrealized translation loss	101.0	101.0
Europe [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Cumulative unrealized translation loss	$ 26.2	$ 26.2
Europe [Member] | Uniwheels [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Foreign currency exchange rate percentage	0.072	0.072
Foreign currency transaction gain (loss), before tax	$ 1.9