Computation of Net Loss Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 28, 2012		Sep. 28, 2012		Jun. 29, 2012		Mar. 30, 2012		Dec. 30, 2011		Sep. 30, 2011		Jul. 01, 2011		Apr. 01, 2011		Dec. 28, 2012		Dec. 30, 2011		Dec. 31, 2010
Earnings Per Share Disclosure [Line Items]
Net (loss) earnings	$ (23.3)		$ (3.9)		$ (4.7)		$ (139.8)		$ (4.9)		$ (130.1)		$ (29.3)		$ (24.1)		$ (171.7)		$ (188.4)		$ 155.6
Denominator for basic net (loss) earnings per share - weighted average shares outstanding																	367.0		364.5		378.1
Employee stock options and restricted and performance stock awards																					4.6
Denominator for diluted net (loss) earnings per share - adjusted weighted average shares outstanding and assumed conversions																	367.0		364.5		382.7
Net (loss) earnings per share, basic	$ (0.06)	[1]	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.38)	[1]	$ (0.01)	[1]	$ (0.36)	[1]	$ (0.08)	[1]	$ (0.07)	[1]	$ (0.47)		$ (0.52)		$ 0.41
Net (loss) earnings per share, diluted	$ (0.06)	[1]	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.38)	[1]	$ (0.01)	[1]	$ (0.36)	[1]	$ (0.08)	[1]	$ (0.07)	[1]	$ (0.47)	[2]	$ (0.52)	[2]	$ 0.41	[2]
Anti-dilutive employee equity-based awards, excluded (in shares)																	19.3	[3]	23.2	[3]	18.5	[3]

[1] The per-share computation for the year is a separate, annual calculation. Accordingly, the sum of the quarterly per-share amounts does not necessarily equal the annual per-share amount.

[2] Dilutive securities are not included in the computation of diluted earnings per share when a company is in a loss position. As such, the numerator and the denominator used in computing both basic and diluted net loss per share for 2012 and 2011 are the same. Diluted weighted average shares outstanding were 368.8 million in 2012 and 367.6 million in 2011.

[3] We exclude certain employee equity-based awards from the weighted average shares outstanding computation because the exercise price was greater than the average market price of the common shares; therefore, the effect would have been anti-dilutive.