Schedule of Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Non-recourse debt — Timber notes
Debt Instrument [Line Items]
Long term debt, interest rate	5.42%	5.42%
Long term debt, due date	2019	2019
Term Loan, due 2022 | Recourse Debt
Debt Instrument [Line Items]
Long term debt, due date	2022	2022
Revenue bonds, due in varying amounts periodically through 2029 | Recourse Debt
Debt Instrument [Line Items]
Long term debt, due date	2029	2029
American & Foreign Power Company, Inc. 5% debentures, due 2030 | Recourse Debt
Debt Instrument [Line Items]
Long term debt, interest rate	5.00%	5.00%
Long term debt, due date	2030	2030