Income Taxes - Temporary Differences and Carryforwards that Comprised Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jan. 01, 2017	Jan. 03, 2016
Income Tax Disclosure [Abstract]
Acquisition related contingent consideration	$ 97,573	$ 52,306
Deferred compensation	44,185	44,402
Postretirement benefits	32,656	27,086
Accrued liabilities	21,666	21,853
Pension (nonunion)	17,381	18,257
Transactional costs	7,155	5,879
Capital lease agreements	5,817	6,105
Charitable contribution carryover	4,409
Pension (union)	3,162	3,290
Net operating loss carryforwards	2,148	3,121
Other	111
Deferred income tax assets	236,263	182,299
Less: Valuation allowance for deferred tax assets	1,618	2,307
Net deferred income tax asset	234,645	179,992
Intangible assets	(204,661)	(169,338)
Depreciation	(134,872)	(95,262)
Investment in Piedmont	(45,128)	(43,109)
Inventory	(13,814)	(9,928)
Prepaid expenses	(6,300)	(4,615)
Patronage dividend	(4,724)	(4,046)
Debt exchange premium		(204)
Other		(434)
Deferred income tax liabilities	(409,499)	(326,936)
Net deferred income tax liability	$ (174,854)	$ (146,944)