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Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 29, 2017
USD ($)
$ / shares
shares
 [1]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]  
Number of shares outstanding, Options Balance | shares 319,000
Number of shares outstanding, Options Granted | shares 56,000
Number of shares outstanding, Options forfeited and expired | shares 0
Number of shares outstanding, Options Exercised | shares (35,000)
Number of shares outstanding, Options Balance | shares 340,000
Number of shares outstanding, Exercisable | shares 204,750
Weighted-average exercise price, Options Balance | $ / shares $ 31.58
Weighted-average exercise price, Options Granted | $ / shares 58.10
Weighted-average exercise price, Options forfeited and expired | $ / shares 0
Weighted-average exercise price, Options Exercised | $ / shares 23.38
Weighted-average exercise price, Options Balance | $ / shares 36.79
Weighted-average exercise price, Exercisable | $ / shares $ 27.55
Weighted average remaining contractual term, Balance 6 years 2 months 23 days
Weighted average remaining contractual term, Exercisable 4 years 10 months 17 days
Aggregate intrinsic value, Balance | $ $ 11,665
Aggregate intrinsic value, Exercisable | $ $ 8,917
[1] Does not include restricted stock or employee stock purchase plans.