Segment Information (Schedule Of Segment Reporting Information By Segment Charges) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Semiconductor Test [Member]
Cost of revenues-provision for excess and obsolete inventory	$ 1,500		$ 5,942	$ 496
Restructuring and other, net	1,279		2,170	1,082
Total	2,779		8,112	1,578
Systems Test Group [Member]
Cost of revenues-provision for excess and obsolete inventory	216	276	401	958
Restructuring and other, net		408	(246)	229
Total	216	684	155	1,187
Corporate And Eliminations [Member]
Restructuring and other, net		(37)	(232)	(37)
Total		$ (37)	$ (232)	$ (37)