Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Detail)

v3.5.0.2
Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2016
USD ($)
Jul. 04, 2015
USD ($)
Jul. 02, 2016
USD ($)
retirement_plan
Jul. 04, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]        
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan     2  
SERP        
Defined Benefit Plan Disclosure        
Service cost $ 43 $ 48 $ 86 $ 97
Interest cost 225 211 450 422
Amortization of prior service cost 103 124 207 247
Amortization of net actuarial losses 86 112 172 225
Net periodic cost 457 495 915 991
SERP Medical        
Defined Benefit Plan Disclosure        
Service cost 1 2 2 3
Interest cost 10 10 20 19
Amortization of prior service cost 6 6 12 13
Amortization of net actuarial losses 6 7 11 12
Net periodic cost $ 23 $ 25 $ 45 $ 47