Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Detail)

v3.2.0.727
Segment Information - Summary of Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Dec. 31, 2014
Segment Reporting Information          
Sales $ 173,156 $ 174,563 $ 334,794 $ 315,514  
Operating profit (loss) 28,155 22,481 45,698 36,108  
Deductions from Operating Profit          
Interest expense, net of interest income (1,111) (2,559) (2,357) (4,882)  
Income before income taxes 27,044 19,922 43,341 31,226  
Total assets 638,210   638,210   $ 562,910
Test Systems          
Segment Reporting Information          
Sales 40,986 53,040 60,272 71,619  
Operating Segments          
Segment Reporting Information          
Operating profit (loss) $ 30,134 $ 24,791 $ 51,311 $ 40,586  
Operating margins (percentage) 17.40% 14.20% 15.30% 12.90%  
Operating Segments | Aerospace          
Segment Reporting Information          
Sales $ 132,170 $ 121,523 $ 274,522 $ 243,895  
Operating profit (loss) $ 20,271 $ 20,761 $ 43,673 $ 38,251  
Operating margins (percentage) 15.30% 17.10% 15.90% 15.70%  
Deductions from Operating Profit          
Total assets $ 518,424   $ 518,424   468,481
Operating Segments | Test Systems          
Segment Reporting Information          
Sales 40,986 $ 53,167 60,327 $ 71,856  
Operating profit (loss) $ 9,863 $ 4,030 $ 7,638 $ 2,335  
Operating margins (percentage) 24.10% 7.60% 12.70% 3.20%  
Deductions from Operating Profit          
Total assets $ 91,817   $ 91,817   69,247
Intersegment Eliminations | Test Systems          
Segment Reporting Information          
Sales 0 $ (127) (55) $ (237)  
Segment Reconciling Items          
Deductions from Operating Profit          
Interest expense, net of interest income 1,111 2,559 2,357 4,882  
Corporate expenses and other 1,979 $ 2,310 5,613 $ 4,478  
Corporate          
Deductions from Operating Profit          
Total assets $ 27,969   $ 27,969   $ 25,182