Retirement Plans (Fair Value of Pension Plan Assets) (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Retirement Plans [Line Items]
Fair value of plan assets	$ 247,519	$ 267,635
Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	247,519	267,635	$ 260,917
Cash and cash equivalents [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	12,306	6,661
Equity [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	120,953	133,833
Fixed income [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	62,490	66,899
Other [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	1,489	1,599
Alternative investments [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	50,281	58,643
Level 1 [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	145,756	157,190
Level 1 [Member] | Cash and cash equivalents [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	12,306	6,661
Level 1 [Member] | Equity [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	120,953	133,833
Level 1 [Member] | Fixed income [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	12,497	16,696
Level 1 [Member] | Other [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 1 [Member] | Alternative investments [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	51,482	51,802
Level 2 [Member] | Cash and cash equivalents [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Equity [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Fixed income [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	49,993	50,203
Level 2 [Member] | Other [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	1,489	1,599
Level 2 [Member] | Alternative investments [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	50,281	58,643
Level 3 [Member] | Cash and cash equivalents [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Equity [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Fixed income [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Other [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Alternative investments [Member] | Pensions [Member]
Retirement Plans [Line Items]
Fair value of plan assets	$ 50,281	$ 58,643	$ 53,116