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Long-term debt - Narrative (Detail)
12 Months Ended
Jun. 29, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 23, 2015
USD ($)
Dec. 28, 2014
USD ($)
Debt Instrument [Line Items]        
Decrease in long term debt   $ 287,000,000    
Repayments of long-term debt   587,000,000    
Long-term debt   4,201,462,000   $ 4,495,882,000
Shelf registration statement maximum amount of securities authorized for issuance   7,000,000,000    
Contractual debt maturities, 2016   266,000,000    
Contractual debt maturities, 2017   72,000,000    
Contractual debt maturities, 2018   131,000,000    
Unsecured notes bearing fixed rate interest at 7.125% due September 2018        
Debt Instrument [Line Items]        
Repayments of debt   $ 180,000,000    
Interest rate stated percentage   7.125%    
Redemption price (as a percent)   101.781%    
Unsecured notes bearing fixed rate interest at 10% due April 2016        
Debt Instrument [Line Items]        
Interest rate stated percentage   10.00%    
Term Loan | Unsecured floating rate term loan due quarterly through June 2020        
Debt Instrument [Line Items]        
Long-term debt $ 200,000,000 $ 180,000,000    
Debt term 5 years      
Line of Credit | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Maximum total leverage ratio through June 30, 2017 5.0      
Maximum total leverage ratio through June 30, 2018 4.75      
Maximum total leverage ratio, thereafter 4.50      
Maximum borrowing capacity     $ 1,400,000,000.0  
Unused borrowing capacity   $ 658,000,000    
Line of Credit | Minimum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Commitment fee percentage 0.25%      
Line of Credit | Maximum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Commitment fee percentage 0.40%      
Line of Credit | Federal Funds Rate | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 0.50%      
Line of Credit | LIBOR | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 1.00%      
Line of Credit | LIBOR | Minimum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 1.75%      
Line of Credit | LIBOR | Maximum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 2.50%      
Line of Credit | ABR | Minimum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 0.75%      
Line of Credit | ABR | Maximum | Amended and Restated Competitive Advance and Revolving Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 1.50%