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Schedule of Segment Reporting Information by Segment Charges and Credit (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Segment Reporting Information [Line Items]        
Restructuring and other-employee severance $ (4,407) $ 12,177 $ 392 $ 16,372
System Test        
Segment Reporting Information [Line Items]        
Cost of revenues-inventory charge $ 251 121 $ 1,609 441
Restructuring and other-employee severance   $ (48)   $ (48)