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Schedule of Fair Value of Senior Notes (Parenthetical) (Detail) - Recourse Debt
3 Months Ended 12 Months Ended
Mar. 26, 2016
Dec. 26, 2015
Carrying Value | 9.75% senior secured notes, due 2019    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 9.75% 9.75%
Long-term debt, due date 2019 2019
Carrying Value | 7.35% debentures, due 2016    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 7.35% 7.35%
Long-term debt, due date 2016 2016
Carrying Value | Revenue bonds, due in varying amounts periodically through 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Carrying Value | American & Foreign Power Company, Inc. 5% debentures, due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 5.00% 5.00%
Long-term debt, due date 2030 2030
Fair Value | 9.75% senior secured notes, due 2019    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 9.75% 9.75%
Long-term debt, due date 2019 2019
Fair Value | 7.35% debentures, due 2016    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 7.35% 7.35%
Long-term debt, due date 2016 2016
Fair Value | Revenue bonds, due in varying amounts periodically through 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Fair Value | American & Foreign Power Company, Inc. 5% debentures, due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, interest rate 5.00% 5.00%
Long-term debt, due date 2030 2030