Revisions - Effect of Revision on Consolidated Statements of Equity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Jan. 03, 2015	Dec. 28, 2013
Retained earnings	$ 146.6		$ 158.1
Total equity	512.7	593.5	548.9	604.4
Net (loss) income	(1.2)	(2.7)
Scenario, Previously Reported [Member]
Retained earnings		167.3		176.3
Total equity		595.2		605.9
Net (loss) income		(2.5)
Scenario, Actual [Member]
Retained earnings		165.6		174.8
Total equity		593.5		604.4
Net (loss) income		(2.7)
Scenario, Adjustment [Member]
Retained earnings		(1.7)		(1.5)
Total equity		(1.7)		(1.5)
Net (loss) income		$ (0.2)