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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Estimated future employer contributions to defined benefit plans in current fiscal year     $ 4,000  
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Estimated future employer contributions to defined benefit plans in current fiscal year     11,000  
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 1,513 $ 1,595 3,026 $ 3,190
Expected return on plan assets (2,318) (2,308) (4,636) (4,616)
Net amortization: Net actuarial loss (gain) 679 485 1,358 970
Net periodic pension (benefit) cost (126) (228) (252) (456)
U.S. Retiree Healthcare Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 262 199 524 398
Interest cost 118 118 236 236
Expected return on plan assets (122) (107) (244) (214)
Net amortization: Prior service cost (credit)   (13)   (26)
Net amortization: Net actuarial loss (gain)   (4)   (8)
Net periodic pension (benefit) cost 258 193 516 386
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,337 1,212 2,674 2,424
Interest cost 402 592 804 1,184
Expected return on plan assets (410) (392) (820) (784)
Net amortization: Prior service cost (credit) 14 (47) 28 (94)
Net amortization: Net actuarial loss (gain) 273 97 546 194
Net periodic pension (benefit) cost $ 1,616 $ 1,462 $ 3,232 $ 2,924