Industry Segment Information (Schedule Of Financial Information Attributable To The Reporting Segments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Segment Reporting Information [Line Items]
Net Sales	$ 2,808,332,000	$ 2,237,978,000	$ 1,826,277,000
Income From Operations	255,713,000	237,735,000	159,520,000
Identifiable Assets	3,266,515,000	2,449,136,000	2,112,237,000
Capital Expenditures	57,621,000	44,994,000	33,604,000
Depreciation and Amortization	98,238,000	72,869,000	69,144,000
Electrical Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	2,533,363,000	2,001,989,000	1,637,668,000
Income From Operations	222,574,000	210,231,000	144,901,000
Identifiable Assets	3,139,260,000	2,323,164,000	1,990,686,000
Capital Expenditures	53,825,000	41,065,000	29,503,000
Depreciation and Amortization	92,017,000	66,746,000	63,749,000
Intersegment sales	2,500,000	2,000,000	1,700,000
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	274,969,000	235,989,000	188,609,000
Income From Operations	33,139,000	27,504,000	14,619,000
Identifiable Assets	127,255,000	125,972,000	121,551,000
Capital Expenditures	3,796,000	3,929,000	4,101,000
Depreciation and Amortization	6,221,000	6,123,000	5,395,000
Intersegment sales	8,800,000	12,500,000	9,400,000
United States [Member]
Segment Reporting Information [Line Items]
Net Sales	1,798,218,000	1,530,866,000	1,335,046,000
Effect of restatement		778,173,000	687,701,000
Asia [Member]
Segment Reporting Information [Line Items]
Net Sales	552,308,000	414,786,000	267,035,000
Effect of restatement		109,000,000	63,424,000
Rest Of The World [Member]
Segment Reporting Information [Line Items]
Net Sales	457,806,000	292,326,000	224,196,000
Effect of restatement		$ 76,636,000	$ 38,665,000