Employee Benefits (Details) (USD $)	12 Months Ended
	Dec. 28, 2013 Agreement		Dec. 29, 2012		Dec. 31, 2011
Change in fair value of plan assets [Roll Forward]
Payable maximum period to be considered current	12 months
Long-term liability	$ (10,645,000)		$ (35,187,000)
Weighted average assumptions in net periodic benefit calculations [Abstract]
Minimum annual assumed rate of increase in the per capita cost of covered benefits (in hundredths)	5.40%
Maximum annual assumed rate of increase in the per capita cost of covered benefits (in hundredths)	9.30%
Ultimate health care cost trend rate (in hundredths)	4.50%
One percent change assumptions [Abstract]
Increase in the accumulated postretirement benefit obligation	1,300,000
Increase in the service and interest cost components of net periodic postretirement benefit costs	100,000
Decrease in the accumulated postretirement benefit obligation	1,100,000
Decrease in the service and interest cost components of net periodic postretirement benefit costs	100,000
Defined Benefit Plan Disclosure [Line Items]
Plan assets	188,870,000		160,980,000
Approximate percentage of common stock invested in major industry (in hundredths)	84.00%		90.00%
Approximate percentage of mutual funds actively managed (in hundredths)	32.00%		32.00%
Approximate percentage of indexed mutual funds	68.00%		68.00%
Percentage of mutual funds' assets that are invested in U.S equities (in hundredths)	33.00%		31.00%
Percent of mutual funds' assets that are invested in non-U.S. equities (in hundredths)	58.00%		59.00%
Percent of mutual funds' assets that are invested in non-U.S. fixed income securities (in hundredths)	9.00%		10.00%
I.A.M Plan Trusts [Abstract]
Number of collective bargaining agreements	2
Pension contributions under the I.A.M. pension plan trusts	900,000		1,000,000		900,000
Percentage of employer contributions (in hundredths)	Less than 5.00%
Maximum percentage funded in the red zone, under the Pension Protection act of 2006 (in hundredths)	65.00%
Maximum percentage funded in the yellow zone, under the Pension Protection act of 2006 (in hundredths)	80.00%
Minimum percentage funded in the green zone, under the Pension Protection act of 2006 (in hundredths)	80.00%
401 (k) Plan [Abstract]
Compensation expense for the Company's matching contribution	3,200,000		2,900,000		3,000,000
Contributions to UMWA 1992 Benefit Plan	290,000		315,000		338,000
Limited partnerships [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	4,493,000
Redemptions	(1,133,000)
Subscriptions	900,000
Net appreciation in fair value	520,000
Ending balance	4,780,000
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	120,655,000		100,792,000
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	63,435,000		55,695,000
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,780,000		4,493,000
Fixed Income Securities [Member]
Target allocation percentage [Abstract]
Company's target allocation (in hundredths)	25.00%
Cash And Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,992,000		13,691,000
Cash And Money Market Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13,992,000		13,691,000
Cash And Money Market Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0		0
Cash And Money Market Funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0		0
Alternative Investments [Member]
Target allocation percentage [Abstract]
Company's target allocation (in hundredths)	20.00%
Common stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	79,497,000	[1]	65,604,000	[2]
Common stock [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	79,497,000	[1]	65,604,000	[2]
Common stock [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	[1]	0	[2]
Common stock [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	[1]	0	[2]
Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	90,601,000	[3]	77,192,000	[4]
Mutual funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	27,166,000	[3]	21,497,000	[4]
Mutual funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	63,435,000	[3]	55,695,000	[4]
Mutual funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	[3]	0	[4]
Limited partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,780,000		4,493,000
Limited partnerships [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0		0
Limited partnerships [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0		0
Limited partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,780,000		4,493,000
Pension Benefits [Member]
Change in benefit obligation [Roll Forward]
Obligation at beginning of year	196,167,000		180,341,000
Service cost	948,000		884,000
Interest cost	7,774,000		8,472,000
Actuarial loss (gain)	(11,635,000)		14,458,000
Benefit payments	(10,668,000)		(10,583,000)
Foreign currency translation adjustment	1,472,000		2,595,000
Obligation at end of year	184,058,000		196,167,000		180,341,000
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	160,980,000		147,502,000
Actual return on plan assets	35,578,000		18,964,000
Employer contributions	1,551,000		3,216,000
Benefit payments	(10,668,000)		(10,583,000)
Foreign currency translation adjustment	1,429,000		1,881,000
Fair value of plan assets at end of year	188,870,000		160,980,000		147,502,000
Funded (underfunded) status at end of year	4,812,000		(35,187,000)
Unrecognized net actuarial loss (gain)	21,128,000		61,125,000
Unrecognized prior service cost	1,000		2,000
Long-term asset	15,457,000		0
Current liability	0		0
Long-term liability	(10,645,000)		(35,187,000)
Total funded (underfunded) status	4,812,000		(35,187,000)
Service cost	948,000		884,000		1,394,000
Interest cost	7,774,000		8,472,000		9,051,000
Expected return on plan assets	(11,059,000)		(10,263,000)		(11,569,000)
Amortization of prior service credit	1,000		1,000		2,000
Amortization of net gain loss	4,005,000		3,883,000		2,346,000
Net periodic benefit cost	1,669,000		2,977,000		1,224,000
Weighted average assumptions in benefit obligations calculations [Abstract]
Discount rate (in hundredths)	4.82%		4.13%
Expected long-term return on plan assets (in hundredths)	7.40%		7.15%
Rate of inflation (in hundredths)	3.40%		2.70%
Weighted average assumptions in net periodic benefit calculations [Abstract]
Discount rate (in hundredths)	4.13%		4.80%		5.25%
Expected long-term return on plan assets (in hundredths)	7.15%		7.11%		7.51%
Rate of inflation (in hundredths)	2.70%		3.00%		3.40%
Asset category [Abstract]
Total plan assets (in hundredths)	100.00%		100.00%
Future expected benefit payments [Abstract]
2014	11,187,000
2015	11,382,000
2016	11,524,000
2017	11,651,000
2018	11,780,000
2019-2023	61,040,000
Total	118,564,000
Company's expected contribution to benefit plans in next fiscal year	1,600,000
Pension Benefits [Member] | Equity Securities [Member]
Asset category [Abstract]
Total plan assets (in hundredths)	86.00%		84.00%
Target allocation percentage [Abstract]
Company's target allocation (in hundredths)	60.00%
Pension Benefits [Member] | Fixed Income Securities [Member]
Asset category [Abstract]
Total plan assets (in hundredths)	4.00%		5.00%
Pension Benefits [Member] | Cash And Money Market Funds [Member]
Asset category [Abstract]
Total plan assets (in hundredths)	7.00%		9.00%
Pension Benefits [Member] | Alternative Investments [Member]
Asset category [Abstract]
Total plan assets (in hundredths)	3.00%		2.00%
Other Benefits [Member]
Change in benefit obligation [Roll Forward]
Obligation at beginning of year	18,096,000		19,945,000
Service cost	413,000		380,000
Interest cost	647,000		635,000
Actuarial loss (gain)	(2,554,000)		(1,838,000)
Benefit payments	(1,211,000)		(1,131,000)
Foreign currency translation adjustment	(10,000)		105,000
Obligation at end of year	15,381,000		18,096,000		19,945,000
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Actual return on plan assets	0		0
Employer contributions	1,211,000		1,131,000
Benefit payments	(1,211,000)		(1,131,000)
Foreign currency translation adjustment	0		0
Fair value of plan assets at end of year	0		0
Funded (underfunded) status at end of year	(15,381,000)		(18,096,000)
Unrecognized net actuarial loss (gain)	(4,016,000)		(1,630,000)
Unrecognized prior service cost	20,000		19,000
Long-term asset	0		0
Current liability	(1,033,000)		(1,187,000)
Long-term liability	(14,348,000)		(16,909,000)
Total funded (underfunded) status	(15,281,000)		(18,096,000)
Service cost	413,000		380,000		344,000
Interest cost	647,000		635,000		993,000
Amortization of prior service credit	(2,000)		(2,000)		(3,000)
Amortization of net gain loss	(160,000)		(73,000)		(2,000)
Net periodic benefit cost	898,000		940,000		1,332,000
Weighted average assumptions in benefit obligations calculations [Abstract]
Discount rate (in hundredths)	4.89%		4.06%
Rate of compensation increases (in hundredths)	5.50%		5.04%
Weighted average assumptions in net periodic benefit calculations [Abstract]
Discount rate (in hundredths)	4.06%		4.97%		5.39%
Rate of compensation increases (in hundredths)	5.04%		5.04%		5.04%
Future expected benefit payments [Abstract]
2014	1,033,000
2015	1,022,000
2016	1,005,000
2017	985,000
2018	973,000
2019-2023	4,864,000
Total	9,882,000
Company's expected contribution to benefit plans in next fiscal year	1,000,000
U.K Plan [Member]
Change in fair value of plan assets [Roll Forward]
Percent of above benefit obligation on company sponsored UK pension plan (in hundredths)	40.00%		36.00%
Percent above plan assets on company sponsored UK pension plan (in hundredths)	34.00%		35.00%
Actuarial net loss to be recognized as components of net periodic benefit cost in 2014	$ 500,000

[1] Approximately 84 percent of common stock represents investments in U.S. companies primarily in the health care, utilities, financials, consumer staples, industrials, and information technology sectors.  All investments in common stock are listed on U.S. stock exchanges.

[2] Approximately 90 percent of common stock represents investments in U.S. companies primarily in the health care, utilities, financials, consumer staples, industrials, information technology, and telecommunications sectors.  All investments in common stock are listed on U.S. stock exchanges.

[3] Approximately 32 percent of mutual funds are actively managed funds and approximately 68 percent of mutual funds are index funds.  Additionally, 33 percent of the mutual funds’ assets are invested in U.S. equities, 58 percent in non-U.S. equities, and 9 percent in non-U.S. fixed income securities.

[4] Approximately 32 percent of mutual funds are actively managed funds and approximately 68 percent of mutual funds are index funds.  Additionally, 31 percent of the mutual funds’ assets are invested in U.S. equities, 59 percent in non-U.S. equities, and 10 percent in non-U.S. fixed income securities.