Fair Value of Financial Instruments - Deferred Compensation Plan, Commodity Hedging Agreements and Acquisition Related Contingent Consideration (Detail) - USD ($) $ in Thousands	Jun. 28, 2015	Mar. 30, 2015	Dec. 29, 2014	Dec. 28, 2014	Jun. 29, 2014	Mar. 31, 2014	Dec. 30, 2013
Assets
Commodity hedging agreements	$ 1,800
Liabilities
Contingent consideration liability	94,068	$ 98,505	$ 46,850		$ 13,000	$ 0	$ 0
Level 1 [Member]
Assets
Deferred compensation plan assets	20,466			$ 18,580	17,990
Liabilities
Deferred compensation plan liabilities	20,466			18,580	17,990
Level 2 [Member] | Commodity Hedging Agreements [Member]
Assets
Commodity hedging agreements	575			0	871
Liabilities
Commodity hedging agreements	681			0	0
Level 3 [Member]
Liabilities
Contingent consideration liability	$ 94,068			$ 46,850	$ 13,000