Associate Retirement Plans - Summary of Actual Assets Allocation (Detail)	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Actual allocation	100.00%	100.00%
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	20.00%
Actual allocation	20.80%	30.60%
Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation	80.00%
Actual allocation	76.90%	68.50%
Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	2.30%	0.90%