Other Postretirement Benefits - Schedule of Effect of One Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect on total service and interest cost (increase)	$ 104
Effect on accumulated postretirement benefit obligation ( increase)	1,966
Effect on total service and interest cost (decrease)	(88)
Effect on accumulated postretirement benefit obligation (decrease)	$ (1,670)