Fair Value Measurements - Carrying Value and Estimated Fair Values of Outstanding Debt (Detail) (USD $) In Millions, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes, carrying value	$ 604.1	$ 390.0
8.375% Senior Notes Due in 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes, carrying value		15.0
8.125% Senior Notes Due in 2018 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes, carrying value	79.1	375.0
5.375% Senior Notes Due in 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes, carrying value	525.0
Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt, fair value	611.0	419.7
Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | 8.375% Senior Notes Due in 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt, fair value		15.6
Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | 8.125% Senior Notes Due in 2018 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt, fair value	83.0	404.1
Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | 5.375% Senior Notes Due in 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt, fair value	$ 528.0