Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Summary of Changes in Shareholders' Equity (Details)

v3.5.0.2
Shareholders' Equity - Summary of Changes in Shareholders' Equity (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 11, 2016
Feb. 24, 2016
USD ($)
shares
Oct. 01, 2016
USD ($)
$ / shares
shares
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
$ / shares
shares
Oct. 03, 2015
USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         $ 300,225  
Foreign currency translation adjustment     $ 49 $ (196) 1,354 $ (3,410)
Retirement liability adjustment – net of tax     130 161 392 484
Net income     12,074 $ 24,694 38,539 $ 53,067
End of period     $ 329,371   $ 329,371  
Common Class Undefined            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
End of period (in shares) | shares     19,479,000   19,479,000  
Convertible Class B Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
End of period (in shares) | shares     9,561,000   9,561,000  
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         $ 294  
Conversion of Class B Shares to Common Shares         0  
Exercise of stock options         2  
End of period     $ 296   $ 296  
Common Stock | Common Class Undefined            
Class of Stock [Line Items]            
Shares authorized (in shares) | shares     40,000,000   40,000,000  
Share par value (in usd per share) | $ / shares     $ 0.01   $ 0.01  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period (in shares) | shares         19,349,000  
Conversion of Class B Shares to Common Shares (in shares) | shares         509,000  
Exercise of stock options (in shares) | shares         138,000  
End of period (in shares) | shares     19,996,000   19,996,000  
Common Stock | Convertible Class B Stock            
Class of Stock [Line Items]            
Shares authorized (in shares) | shares     15,000,000   15,000,000  
Share par value (in usd per share) | $ / shares     $ 0.01   $ 0.01  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period (in shares) | shares         10,006,000  
Conversion of Class B Shares to Common Shares (in shares) | shares         (509,000)  
Exercise of stock options (in shares) | shares         64,000  
End of period (in shares) | shares     9,561,000   9,561,000  
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         $ 57,827  
Exercise of stock options         4,429  
Stock compensation expense         1,876  
End of period     $ 64,132   64,132  
Accumulated Other Comprehensive Loss            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         (15,064)  
Foreign currency translation adjustment         1,354  
Retirement liability adjustment – net of tax         392  
End of period     (13,318)   (13,318)  
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         257,168  
Net income         38,539  
End of period     295,707   295,707  
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning of period         $ 0  
Beginning of period (in shares) | shares         0  
Purchase   $ (17,500)     $ (17,446)  
Purchase (in shares) | shares   (517,000)     (517,000)  
End of period     $ (17,446)   $ (17,446)  
End of period (in shares) | shares     (517,000)   (517,000)  
Subsequent Event | Convertible Class B Stock            
Class of Stock [Line Items]            
Common stock conversion 0.15