Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Detail)

v3.5.0.2
Segment Information - Summary of Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Dec. 31, 2015
Segment Reporting Information          
Sales $ 164,426 $ 173,156 $ 323,956 $ 334,794  
Operating profit (loss) 22,611 28,155 40,210 45,698  
Deductions from Operating Profit          
Interest expense, net of interest income (1,056) (1,111) (2,143) (2,357)  
Income before income taxes 21,555 27,044 38,067 43,341  
Total assets 612,251   612,251   $ 609,243
Aerospace          
Segment Reporting Information          
Sales 142,501 132,170 280,810 274,522  
Test Systems          
Segment Reporting Information          
Sales 21,925 40,986 43,146 60,272  
Operating Segments          
Segment Reporting Information          
Operating profit (loss) $ 25,925 $ 30,134 $ 46,826 $ 51,311  
Operating margins (percentage) 15.80% 17.40% 14.50% 15.30%  
Operating Segments | Aerospace          
Segment Reporting Information          
Sales $ 142,528 $ 132,170 $ 281,177 $ 274,522  
Operating profit (loss) $ 24,851 $ 20,271 $ 43,542 $ 43,673  
Operating margins (percentage) 17.40% 15.30% 15.50% 15.90%  
Deductions from Operating Profit          
Total assets $ 505,612   $ 505,612   510,884
Operating Segments | Test Systems          
Segment Reporting Information          
Sales 21,925 $ 40,986 43,146 $ 60,327  
Operating profit (loss) $ 1,074 $ 9,863 $ 3,284 $ 7,638  
Operating margins (percentage) 4.90% 24.10% 7.60% 12.70%  
Deductions from Operating Profit          
Total assets $ 81,361   $ 81,361   64,934
Intersegment Eliminations | Aerospace          
Segment Reporting Information          
Sales (27) $ 0 (367) $ 0  
Intersegment Eliminations | Test Systems          
Segment Reporting Information          
Sales 0 0 0 (55)  
Segment Reconciling Items          
Deductions from Operating Profit          
Interest expense, net of interest income 1,056 1,111 2,143 2,357  
Corporate expenses and other 3,314 $ 1,979 6,616 $ 5,613  
Corporate          
Deductions from Operating Profit          
Total assets $ 25,278   $ 25,278   $ 33,425