Derivatives and Fair Value of Financial Instruments (Details 2)	6 Months Ended	12 Months Ended
	Jul. 04, 2015 USD ($) lease agreement T lb bu	Dec. 31, 2014 USD ($) agreement T lb gal bu	Dec. 31, 2010 USD ($) agreement
Net commodity purchase contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount	32,400,000	19,800,000
Net commodity purchase contracts | Grain
Derivative commodity instruments
Nonmonetary notional amount | bu	17,087,000	10,697,000
Net commodity purchase contracts | Soybean oil
Derivative commodity instruments
Nonmonetary notional amount	3,240,000	19,620,000
Net commodity purchase contracts | Soybean meal
Derivative commodity instruments
Nonmonetary notional amount | T	312,000	85,000
Net commodity purchase contracts | Dry whey powder
Derivative commodity instruments
Nonmonetary notional amount	220,000	88,000
Net commodity purchase contracts | Sugar
Derivative commodity instruments
Nonmonetary notional amount		15,551,000
Net commodity sale contracts | Sugar
Derivative commodity instruments
Nonmonetary notional amount	1,722,000
Net commodity sale contracts | Heating oil
Derivative commodity instruments
Nonmonetary notional amount | gal		4,326,000
Foreign currencies
Derivative commodity instruments
Notional amounts | $	$ 45,737,000	$ 143,961,000
Interest rate swaps
Derivative commodity instruments
Notional amounts | $	$ 141,000,000	$ 163,000,000	$ 25,000,000
Number of derivative agreements | agreement	6	7	3
Term of derivative contract			10 years
Eight-year interest rate exchange agreements
Derivative commodity instruments
Notional amounts | $	$ 22,000,000
Number of derivative agreements | agreement		4
Number of dry bulk vessel leases | lease	4
Term of derivative contract		8 years
Number of derivative agreements terminated | agreement	1