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Fair Value Measurements - Carrying Value and Estimated Fair Values of Outstanding Debt (Detail) - USD ($)
$ in Millions
Jan. 02, 2016
Jan. 03, 2015
Dec. 12, 2014
Jun. 24, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior notes, carrying value $ 1,519.9 $ 1,532.6    
6.750% Senior Notes Due in 2020 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior notes, carrying value 613.0 610.8 $ 625.0  
10.000% Senior Notes Due in 2021 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior notes, carrying value 390.1 405.6    
Outstanding debt, fair value     $ 406.0  
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 516.8 516.2   $ 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 1,561.1 1,515.2    
Level 1 [Member] | 6.750% Senior Notes Due in 2020 [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 641.4 630.1    
Level 1 [Member] | 10.000% Senior Notes Due in 2021 [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 397.3 403.4    
Level 1 [Member] | 5.375% Senior Notes Due in 2022 [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 $ 522.4 $ 481.7