Acquisitions and Dispositions, Acquisition (Details) - USD ($) $ in Thousands							12 Months Ended
		Apr. 26, 2016	Jul. 31, 2015	Jun. 18, 2015	Mar. 30, 2015	Feb. 28, 2014	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Business Acquisition [Line Items]
Equity method investment, ownership percentage							50.00%
Cash paid for acquisition							$ 20,533	$ 105,944	$ 30,137
Allocated to [Abstract]
Goodwill							123,993	120,252	$ 102,909
Noncontrolling interests							$ 37,753	$ 32,417
Customer Relationships [Member]
Intangible asset type [Abstract]
Estimated Useful Life							20 years
Non-compete Agreements [Member] | Minimum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							3 years
Non-compete Agreements [Member] | Maximum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							5 years
Patents and Technology [Member] | Minimum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							10 years
Patents and Technology [Member] | Maximum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							15 years
Trade Names and Licenses [Member] | Minimum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							5 years
Trade Names and Licenses [Member] | Maximum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							10 years
Other [Member] | Minimum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							2 years
Other [Member] | Maximum [Member]
Intangible asset type [Abstract]
Estimated Useful Life							5 years
Jungwoo Metal Ind. Co., LTD [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage		60.00%
Cash paid for acquisition		$ 20,500
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Total consideration		20,533
Allocated to [Abstract]
Accounts receivable		5,551
Inventories		17,616
Other current assets		1,437
Property, plant, and equipment		24,191
Goodwill	[1]	442
Intangible assets		756
Other assets		58
Total assets acquired		50,051
Accounts payable		7,252
Accrued wages & other employee costs		0
Other current liabilities		577
Long-term debt		8,659
Pension and other postretirement liabilities		799
Other noncurrent liabilities		582
Total liabilities assumed		17,869
Noncontrolling interests		11,649
Net assets acquired		20,533
Jungwoo Metal Ind. Co., LTD [Member] | Customer Relationships [Member]
Allocated to [Abstract]
Intangible assets		0
Jungwoo Metal Ind. Co., LTD [Member] | Non-compete Agreements [Member]
Allocated to [Abstract]
Intangible assets		0
Jungwoo Metal Ind. Co., LTD [Member] | Patents and Technology [Member]
Allocated to [Abstract]
Intangible assets		756
Jungwoo Metal Ind. Co., LTD [Member] | Trade Names and Licenses [Member]
Allocated to [Abstract]
Intangible assets		0
Jungwoo Metal Ind. Co., LTD [Member] | Other [Member]
Allocated to [Abstract]
Intangible assets		$ 0
Great Lakes Copper, Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition			$ 70,000
Deferred tax liability							$ 4,100
Cost of acquisition, post-closing working capital adjustment			1,500
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Total consideration			70,011
Allocated to [Abstract]
Accounts receivable			26,079
Inventories			15,233
Other current assets			22
Property, plant, and equipment			22,771
Goodwill	[1]		23,208
Intangible assets			27,468
Other assets			1,413
Total assets acquired			116,194
Accounts payable			36,026
Accrued wages & other employee costs			0
Other current liabilities			381
Long-term debt			0
Pension and other postretirement liabilities			5,655
Other noncurrent liabilities			4,121
Total liabilities assumed			46,183
Noncontrolling interests			0
Net assets acquired			70,011
Great Lakes Copper, Inc [Member] | Customer Relationships [Member]
Allocated to [Abstract]
Intangible assets			20,273
Great Lakes Copper, Inc [Member] | Non-compete Agreements [Member]
Allocated to [Abstract]
Intangible assets			2,269
Great Lakes Copper, Inc [Member] | Patents and Technology [Member]
Allocated to [Abstract]
Intangible assets			3,104
Great Lakes Copper, Inc [Member] | Trade Names and Licenses [Member]
Allocated to [Abstract]
Intangible assets			2,453
Great Lakes Copper, Inc [Member] | Other [Member]
Allocated to [Abstract]
Intangible assets			$ (631)
Sherwood Valve Products, LLC [Member]
Business Acquisition [Line Items]
Cash paid for acquisition				$ 21,800
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Total consideration				21,795
Allocated to [Abstract]
Accounts receivable				6,490
Inventories				11,892
Other current assets				260
Property, plant, and equipment				10,327
Goodwill				0
Intangible assets				(38)
Other assets				0
Total assets acquired				28,931
Accounts payable				6,022
Accrued wages & other employee costs				471
Other current liabilities				487
Long-term debt				0
Pension and other postretirement liabilities				0
Other noncurrent liabilities				156
Total liabilities assumed				7,136
Noncontrolling interests				0
Net assets acquired				$ 21,795
Turbotec Products, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for acquisition					$ 14,100
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Total consideration					14,138
Allocated to [Abstract]
Accounts receivable					1,936
Inventories					3,247
Other current assets					72
Property, plant, and equipment					9,080
Goodwill					2,088
Intangible assets					880
Other assets					59
Total assets acquired					17,362
Accounts payable					1,603
Accrued wages & other employee costs					356
Other current liabilities					51
Long-term debt					0
Pension and other postretirement liabilities					0
Other noncurrent liabilities					1,214
Total liabilities assumed					3,224
Noncontrolling interests					0
Net assets acquired					14,138
Turbotec Products, Inc. [Member] | Customer Relationships [Member]
Allocated to [Abstract]
Intangible assets					350
Turbotec Products, Inc. [Member] | Non-compete Agreements [Member]
Allocated to [Abstract]
Intangible assets					90
Turbotec Products, Inc. [Member] | Patents and Technology [Member]
Allocated to [Abstract]
Intangible assets					220
Turbotec Products, Inc. [Member] | Trade Names and Licenses [Member]
Allocated to [Abstract]
Intangible assets					220
Turbotec Products, Inc. [Member] | Other [Member]
Allocated to [Abstract]
Intangible assets					$ 0
KME Yorkshire Limited [Member]
Business Acquisition [Line Items]
Cash paid for acquisition						$ 30,100
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Total consideration						30,137
Allocated to [Abstract]
Accounts receivable						0
Inventories						17,579
Other current assets						1,034
Property, plant, and equipment						2,103
Goodwill	[1]					8,075
Intangible assets						16,937
Other assets						0
Total assets acquired						45,728
Accounts payable						10,188
Accrued wages & other employee costs						1,167
Other current liabilities						4,236
Long-term debt						0
Pension and other postretirement liabilities						0
Other noncurrent liabilities						0
Total liabilities assumed						15,591
Noncontrolling interests						0
Net assets acquired						30,137
KME Yorkshire Limited [Member] | Customer Relationships [Member]
Allocated to [Abstract]
Intangible assets						10,699
KME Yorkshire Limited [Member] | Non-compete Agreements [Member]
Allocated to [Abstract]
Intangible assets						4,504
KME Yorkshire Limited [Member] | Patents and Technology [Member]
Allocated to [Abstract]
Intangible assets						0
KME Yorkshire Limited [Member] | Trade Names and Licenses [Member]
Allocated to [Abstract]
Intangible assets						1,055
KME Yorkshire Limited [Member] | Other [Member]
Allocated to [Abstract]
Intangible assets						$ 679

[1] Tax-deductible goodwill