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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Mar. 14, 2012
May. 25, 2011
Dec. 26, 2015
Dec. 27, 2014
Nov. 05, 2013
Debt Instrument [Line Items]          
Acquisition of voting power     50.00%    
Effective interest rate on short-term borrowings     4.00%    
Short-term borrowings maximum month end amount     $ 6,000,000    
Short-term borrowings maximum amount occurred month     2015-06    
Short-term borrowings maximum monthly average occurred month     2015-07    
Maximum          
Debt Instrument [Line Items]          
Short-term borrowings maximum monthly average amount     $ 5,000,000    
Amended Credit Agreement          
Debt Instrument [Line Items]          
Credit Agreement, maximum borrowing capacity   $ 1,250,000,000      
Credit Agreement, increased borrowing capacity   $ 250,000,000      
Extended maturity date   May 25, 2017      
Minimum availability level of borrowings to avoid fixed charge coverage ratio test     125,000,000    
Excess of debt default amount resulting termination of Facility     $ 25,000,000    
Excess acquisition of ownership percentage resulting termination of Facility     40.00%    
Available credit under the Facility     $ 1,200,000,000    
Amount outstanding under credit facility     0    
Amount outstanding under letters of credit     84,000,000    
Average borrowings under the Facility     $ 0    
Amended Credit Agreement | Federal Funds Rate Plus          
Debt Instrument [Line Items]          
Alternate base rate and one month adjusted LIBO rate     0.50%    
Amended Credit Agreement | Adjusted LIBO Rate          
Debt Instrument [Line Items]          
Alternate base rate and one month adjusted LIBO rate     1.00%    
Line Of Credit Sub-Facility          
Debt Instrument [Line Items]          
Credit Agreement, current borrowing capacity   $ 200,000,000      
Letter Of Credit Sub Facility          
Debt Instrument [Line Items]          
Credit Agreement, current borrowing capacity   400,000,000      
Swing Line Loan Facility          
Debt Instrument [Line Items]          
Credit Agreement, current borrowing capacity   125,000,000      
Swing Line Loan Facility to European Borrowers          
Debt Instrument [Line Items]          
Credit Agreement, current borrowing capacity   $ 25,000,000      
Global Availability          
Debt Instrument [Line Items]          
Minimum availability level of borrowings to avoid cash settlement     $ 150,000,000    
European Availability          
Debt Instrument [Line Items]          
Minimum availability level of borrowings to avoid cash settlement     $ 25,000,000    
Amendment          
Debt Instrument [Line Items]          
Credit Agreement, maximum borrowing capacity         $ 1,250,000,000
Credit Agreement, current borrowing capacity         $ 1,000,000,000
9.75% senior secured notes, due 2019          
Debt Instrument [Line Items]          
Extended maturity date Mar. 15, 2019        
Aggregate principal amount of senior notes $ 250,000,000        
Interest rate on senior notes 9.75%        
Senior notes, redemption rate excluding premium percentage     100.00%    
Redemption prices, plus accrued and unpaid interest, Percentage     101.00%    
9.75% senior secured notes, due 2019 | Redeemed On or Prior To March 15, 2016          
Debt Instrument [Line Items]          
Senior notes, redemption rate of principal amount     104.875%    
Senior notes, early redemption date     Mar. 15, 2016    
Recourse Debt | Revenue bonds, due in varying amounts periodically through 2029          
Debt Instrument [Line Items]          
Senior secured notes, due date     2029 2029  
Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030          
Debt Instrument [Line Items]          
Interest rate on senior notes     5.00% 5.00%  
Senior secured notes, due date     2030 2030  
Recourse Debt | 7.35% debentures, due 2016          
Debt Instrument [Line Items]          
Interest rate on senior notes     7.35%    
Senior secured notes, due date     2016    
Recourse Debt | 7.35% debentures, due 2016 | Current Liability          
Debt Instrument [Line Items]          
Interest rate on senior notes     7.35% 7.35%  
Senior secured notes, due date     2016 2016  
Short-term borrowings     $ 4,000,000 $ 1,000,000