Schedule of Segment Reporting Information by Segment Charges and Credit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Segment Reporting Information [Line Items]
Restructuring and other	$ 12,177	$ 261	$ 16,372	$ (124)
System Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	121	460	441	8,225
Restructuring and other	(48)	923	(48)	923
Total	$ 73	$ 1,383	$ 393	$ 9,148