Industry Segments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Industry Segments [Abstract]
Decrease in accruals related to import duties included in cost of goods sold			$ 3,100,000
Summary of segment information [Abstract]
Net sales	602,820,000	528,854,000	1,826,885,000	1,670,826,000
Cost of goods sold	521,278,000	456,302,000	1,574,830,000	1,440,277,000
Depreciation and amortization	8,952,000	7,882,000	25,651,000	24,364,000
Selling, general, and administrative expense	34,864,000	32,921,000	102,167,000	99,078,000
Gain on sale of plastic fittings manufacturing assets	0	(39,765,000)	0	(39,765,000)
Impairment charges	0	4,304,000	0	4,304,000
Insurance settlement	0	0	0	(106,332,000)
Operating income	37,726,000	67,210,000	124,237,000	248,900,000
Interest expense	(1,430,000)	(1,243,000)	(3,913,000)	(2,940,000)
Other income, net	225,000	842,000	440,000	4,324,000
Income before income taxes	36,521,000	66,809,000	120,764,000	250,284,000
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(2,906,000)	(3,164,000)	(9,497,000)	(12,510,000)
Cost of goods sold	(2,874,000)	(3,132,000)	(9,398,000)	(12,380,000)
Depreciation and amortization	517,000	560,000	1,725,000	1,649,000
Selling, general, and administrative expense	5,858,000	6,406,000	18,789,000	19,665,000
Gain on sale of plastic fittings manufacturing assets		0		0
Impairment charges		0		0
Insurance settlement				(2,437,000)
Operating income	(6,407,000)	(6,998,000)	(20,613,000)	(19,007,000)
Plumbing and Refrigeration Segment [Member] | Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	357,843,000	301,622,000	1,093,060,000	942,109,000
Cost of goods sold	308,927,000	258,035,000	934,208,000	800,782,000
Depreciation and amortization	5,287,000	4,172,000	14,803,000	12,861,000
Selling, general, and administrative expense	23,473,000	20,736,000	67,678,000	61,245,000
Gain on sale of plastic fittings manufacturing assets		(39,765,000)		(39,765,000)
Impairment charges		4,173,000		4,173,000
Insurance settlement				(103,895,000)
Operating income	20,156,000	54,271,000	76,371,000	206,708,000
OEM Segment [Member] | Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	247,883,000	230,396,000	743,322,000	741,227,000
Cost of goods sold	215,225,000	201,399,000	650,020,000	651,875,000
Depreciation and amortization	3,148,000	3,150,000	9,123,000	9,854,000
Selling, general, and administrative expense	5,533,000	5,779,000	15,700,000	18,168,000
Gain on sale of plastic fittings manufacturing assets		0		0
Impairment charges		131,000		131,000
Insurance settlement				0
Operating income	$ 23,977,000	$ 19,937,000	$ 68,479,000	$ 61,199,000