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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Pension benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 842 $ 850 $ 998
Interest cost 1,229 1,286 1,167
Expected return on plan assets (1,421) (1,480) (1,506)
Recognized net actuarial loss 508 315 533
Amortization of prior service cost 55 55 55
Net periodic benefit cost 1,213 1,026 1,247
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 187 261 171
Interest cost 175 225 207
Expected return on plan assets 0 0 0
Recognized net actuarial loss 56 34 62
Amortization of prior service cost 90 91 85
Net periodic benefit cost $ 508 $ 611 $ 525