Revisions - Effect of Revision on Consolidated Statements of Equity (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015	Dec. 28, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings	$ 142.2		$ 142.2		$ 158.1
Total equity	677.0	$ 589.0	677.0	$ 589.0	$ 548.9	$ 604.4
Net (loss) income	$ 18.3	(4.5)	$ 17.1	(7.2)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings		154.5		154.5		176.3
Total equity		590.6		590.6		605.9
Net (loss) income		(4.6)		(7.1)
Scenario, Actual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings		152.9		152.9		174.8
Total equity		589.0		589.0		604.4
Net (loss) income		(4.5)		(7.2)
Scenario, Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings		(1.6)		(1.6)		(1.5)
Total equity		(1.6)		(1.6)		$ (1.5)
Net (loss) income		$ 0.1		$ (0.1)