Income Taxes - Temporary Differences and Carryforwards that Comprised Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017
Income Tax Disclosure [Abstract]
Acquisition related contingent consideration	$ 94,055	$ 97,573
Deferred compensation	27,097	44,185
Deferred revenue	18,704
Postretirement benefits	16,443	32,656
Accrued liabilities	15,523	21,666
Pension (nonunion)	8,303	17,381
Transactional costs	5,733	7,155
Capital lease agreements	3,377	5,817
Charitable contribution carryover	3,770	4,409
Pension (union)	1,922	3,162
Net operating loss carryforwards	1,923	2,148
Other	1,669	111
Deferred income tax assets	198,519	236,263
Less: Valuation allowance for deferred tax assets	4,337	1,618
Net deferred income tax asset	194,182	234,645
Intangible assets	(154,425)	(204,661)
Depreciation	(105,685)	(134,872)
Investment in Piedmont	(25,895)	(45,128)
Inventory	(9,781)	(13,814)
Prepaid expenses	(8,399)	(6,300)
Patronage dividend	(2,361)	(4,724)
Deferred income tax liabilities	(306,546)	(409,499)
Net deferred income tax liability	$ (112,364)	$ (174,854)