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Postretirement Plans - Summary of Weighted-Average Discount Rates Used to Determine Postretirement Health Care Expenses (Detail)
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.50% 4.10% 5.10%
U.S. Postretirement Health Care Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.10% 3.60% 4.20%