Consolidated Accumulated Other Comprehensive (Loss) Income - Reclassifications Out of Accumulated Other Comprehensive (Loss) Income to Total Net Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (292.3)	$ (288.1)	$ (293.5)	$ (268.1)	$ (262.7)	$ (229.0)	$ (141.1)	$ (140.3)	$ (1,142.0)	$ (773.1)	$ (536.8)
Income tax (expense) benefit									30.0	(21.2)	15.1
Net (loss) income									7.1	(71.5)	20.6
Reclassification Out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net (loss) income									1.0	5.8	(1.1)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income [Member] | Gains and Losses on Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales									1.3	6.4	(1.5)
Total before taxes									1.3	6.4	(1.5)
Income tax (expense) benefit										(0.1)	0.8
Net (loss) income									1.3	6.3	(0.7)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income [Member] | Pension Benefit Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs										(0.1)	(0.1)
Actuarial (losses)/gains									(0.3)	(0.4)	(0.4)
Total before taxes									(0.3)	(0.5)	(0.5)
Income tax (expense) benefit											0.1
Net (loss) income									$ (0.3)	$ (0.5)	$ (0.4)