Summary of Stock Option Activity Plans (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Shares	22,702,534	12,578,071	19,059,176
Granted, Shares		2,003,000	82,000
Forfeited, Shares	(1,323,664)	(2,072,560)	(4,512,372)
Exercised, Shares	(12,776,244)	(2,948,328)	(2,050,733)
Outstanding at end of year, Shares	8,602,626	22,702,534	12,578,071
Outstanding at beginning of year, Weighted Average Exercise Price	$ 4.48	$ 5.25	$ 6.90
Granted, Weighted Average Exercise Price		$ 5.24	$ 3.22
Forfeited, Weighted Average Exercise Price	$ 10.46	$ 8.83	$ 14.51
Exercised, Weighted Average Exercise Price	$ 3.83	$ 1.40	$ 0.88
Outstanding at end of year, Weighted Average Exercise Price	$ 4.53	$ 4.48	$ 5.25
Assumed-Merger
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares		13,142,351
Granted, Weighted Average Exercise Price		$ 3.62