Unaudited Quarterly Financial Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Selected Quarterly Information [Line Items]
Total revenue	$ 333.4	$ 358.8	$ 361.5	$ 352.2	$ 339.4	$ 403.2	$ 433.2	$ 413.0	$ 1,405.9	$ 1,588.8	$ 1,599.7
Gross margin	99.3	120.1	117.7	104.9	101.7	144.8	160.7	152.0	442.0	559.2	563.0
Net income	$ (13.6)	$ 24.7	$ 11.9	$ 1.6	$ 21.3	$ 35.8	$ 44.9	$ 43.5	$ 24.6	$ 145.5	$ 153.2
Basic income (loss) per common share	$ (0.11)	$ 0.19	$ 0.09	$ 0.01	$ 0.17	$ 0.28	$ 0.35	$ 0.34	$ 0.19	$ 1.15	$ 1.23
Diluted income (loss) per common share	$ (0.11)	$ 0.19	$ 0.09	$ 0.01	$ 0.17	$ 0.28	$ 0.34	$ 0.33	$ 0.19	$ 1.12	$ 1.20