Segment information (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011	Jul. 02, 2011
Segment Reporting Information [Line Items]
Sales	$ 6,693,573	$ 6,767,495	$ 13,119,579	$ 12,949,883
Property, plant and equipment, net	440,445		440,445		419,173
United States [Member]
Segment Reporting Information [Line Items]
Sales	2,630,000	2,630,000	5,030,000	5,040,000
Property, plant and equipment, net	252,900		252,900		231,300
Germany [Member]
Segment Reporting Information [Line Items]
Sales	632,700	1,360,000	779,600	1,480,000
Property, plant and equipment, net	92,100		92,100		92,800
United kingdom [Member]
Segment Reporting Information [Line Items]
Sales	382,000	740,200	445,400	871,300
Property, plant and equipment, net	16,400		16,400		16,400
Taiwan [Member]
Segment Reporting Information [Line Items]
Sales	471,200	422,600	982,300	865,600
China [Member]
Segment Reporting Information [Line Items]
Sales	581,500	578,600	1,160,000	1,170,000
Singapore [Member]
Segment Reporting Information [Line Items]
Sales	288,100	294,300	593,900	581,900
Belgium [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 24,000		$ 24,000		$ 23,400