Pension and Postretirement Benefit Plans Asset Allocation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	100.00%		100.00%
Cash
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	1.00%		3.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	31.00%		29.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	68.00%		68.00%
Pension Plans | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	151,236		140,706
Pension Plans | Total | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,942		4,209
Pension Plans | Total | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46,293		40,633
Pension Plans | Total | U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,877	[1]	7,012	[1]
Pension Plans | Total | U.S mid-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,509	[2]	10,071	[2]
Pension Plans | Total | Global equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,483	[3]	21,991
Pension Plans | Total | Emerging markets (d)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,424	[4]	1,559	[4]
Pension Plans | Total | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	103,001		95,864
Pension Plans | Total | U.S. fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,121	[5]	4,321
Pension Plans | Total | Foreign fixed income funds (f)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,880	[6]	91,543	[7]
Pension Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,869		11,341
Pension Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,942		384
Pension Plans | Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,806		6,636
Pension Plans | Level 1 | U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,190	[1]	5,381	[1]
Pension Plans | Level 1 | U.S mid-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	522	[2]	842	[2]
Pension Plans | Level 1 | Global equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0
Pension Plans | Level 1 | Emerging markets (d)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,094	[4]	413	[4]
Pension Plans | Level 1 | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,121		4,321
Pension Plans | Level 1 | U.S. fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,121	[5]	4,321
Pension Plans | Level 1 | Foreign fixed income funds (f)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[6]	0	[7]
Pension Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	137,367		129,365
Pension Plans | Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		3,825
Pension Plans | Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38,487		33,997
Pension Plans | Level 2 | U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,687	[1]	1,631	[1]
Pension Plans | Level 2 | U.S mid-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,987	[2]	9,229	[2]
Pension Plans | Level 2 | Global equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,483	[3]	21,991
Pension Plans | Level 2 | Emerging markets (d)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,330	[4]	1,146	[4]
Pension Plans | Level 2 | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,880		91,543
Pension Plans | Level 2 | U.S. fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[5]	0
Pension Plans | Level 2 | Foreign fixed income funds (f)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,880	[6]	91,543	[7]
Pension Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Pension Plans | Level 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Pension Plans | Level 3 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Pension Plans | Level 3 | U.S. small-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Pension Plans | Level 3 | U.S mid-cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Pension Plans | Level 3 | Global equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0
Pension Plans | Level 3 | Emerging markets (d)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[4]	0	[4]
Pension Plans | Level 3 | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Pension Plans | Level 3 | U.S. fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[5]	0
Pension Plans | Level 3 | Foreign fixed income funds (f)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[6]	0	[7]

[1] This category consists of commingled and registered mutual funds that focus on equity securities of U.S companies. It includes both indexed and actively managed funds.

[2] This category consists of commingled and registered mutual funds that focus on equity securities of companies outside of the U.S. It includes both indexed and actively managed funds.

[3] This category consists of commingled and registered mutual funds that invest in equity securities of both U.S. and foreign companies. It includes actively managed funds

[4] This category consists of commingled and registered mutual funds that invest in equity securities of companies in emerging market economies. It includes actively managed funds.

[5] This category consists of actively managed funds that invest in investment-grade bonds of U.S. issuers from diverse industries and U.S. government bonds and treasury notes.

[6] This category consists of funds that invest in investment-grade bonds of foreign companies and Euro region government bonds.

[7] This category consists of funds that invest in investment-grade bonds of foreign companies and Euro region government bonds