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Employee Benefit Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 20, 2017
Mar. 09, 2015
Apr. 01, 2017
Apr. 02, 2016
Apr. 04, 2015
Jul. 01, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Number of shares available for grant             486,681    
Tax benefits related to employees' and directors' stock plans                 $ 881
Share price (in dollars per share)             $ 100.4    
Cost recognized, defined contribution plan             $ 3,327 $ 3,005 $ 2,749
Pension benefits                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Future amortization of loss             665    
Future amortization of prior service cost (credit)             93    
Pension benefits | U.S. Pension                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Estimated future employer contribution, next year             $ 0    
Pension benefits | Debt Securities                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Maximum weighted-average maturity, debt securities             10 years    
Average benchmark duration for debt securities             5 years    
Restricted stock units for non employee directors (RSUs)                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Grants in period     3,000 5,000 5,000        
Restricted stock units for non employee directors change of control                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Grants in period   50,000              
Grants in period per employee (in shares)   10,000              
Fair value of RSU's outstanding   $ 2,279              
Forfeited / expired (in shares)                 10,000
Unvested RSU's at end of year (in shares)               40,000  
Performance shares                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Shares received upon vesting (in shares)             1    
Award vesting period             3 years    
Compensation cost not yet recognized             $ 2,124    
Compensation cost not yet recognized, recognition period             1 year 3 months 18 days    
Time-based restricted stock units                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Shares received upon vesting (in shares)             1    
Compensation cost not yet recognized             $ 2,565    
Compensation cost not yet recognized, recognition period             1 year 9 months 18 days    
Restricted stock unit awards                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Grants in period             110,000    
Forfeited / expired (in shares)             3,000    
Unvested RSU's at end of year (in shares)             199,000 203,000  
Weighted average grant date fair value, granted (in dollars per share)             $ 59.30 $ 40.41 $ 44.75
Fair value of awards vested in period             $ 6,719 $ 6,233 $ 7,502
Weighted-average grant date fair value (in dollars per share)             $ 49.32 $ 40.23  
Restricted stock unit awards | Former vice president, general counsel and secretary                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Grants in period 4,254                
Weighted-average grant date fair value (in dollars per share) $ 93.82                
Compensation and options expense for arrangement with former vice president, general counsel and secretary $ 332                
Stock option awards                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Award vesting period             3 years    
Award expiration period             10 years    
Options exercised during the period (in shares)             0    
Employee Stock Purchase Plan Awards                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Discount to market under the ESOP             15.00%    
Maximum period of restriction on resale under ESOP             1 year    
Maximum participation based on compensation percentage under ESOP             10.00%    
Stock issued during period under ESOP             13,156 17,874 13,573
Forecast | Former vice president, general counsel and secretary                  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                  
Compensation expense for arrangement with former vice president, general counsel and secretary           $ 374