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Restricted Stock and Performance-Based Restricted Stock Activity Related to Equity Incentive Plans (Detail) - $ / shares
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Restricted Stock, Nonvested Shares at beginning of period 194,604 276,220 316,332
Restricted Stock, Nonvested Shares granted [1] 91,430 72,250 97,650
Restricted Stock, Nonvested Shares cancelled (12,692) (16,109) (13,970)
Restricted Stock, Nonvested Shares vested (82,963) (137,757) (123,792)
Restricted Stock, Nonvested Shares at end of period 190,379 194,604 276,220
Weighted Average Grant Date Fair Value at beginning of period $ 147.94 $ 97.48 $ 75.74
Weighted Average Grant Date Fair Value, granted [1] 271.33 205.21 131.75
Weighted Average Grant Date Fair Value, cancelled 178.06 115.71 88.34
Weighted Average Grant Date Fair Value, vested 128.57 80.55 70.39
Weighted Average Grant Date Fair Value at end of period $ 213.57 $ 147.94 $ 97.48
[1] The weighted average grant date fair value for performance-based restricted shares granted was calculated based on the market price on the grant dates. Certain tranches will ultimately be valued when the performance condition is established for each tranche, which generally occurs in the fourth quarter of each fiscal year.