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Stock-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of options granted $ 10.59 $ 8.09 $ 6.54
Total intrinsic value of options exercised $ 0 $ 1,461,000 $ 999,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 23,200,000 $ 21,300,000 $ 18,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 40.61 $ 29.50 $ 24.14
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average purchase price $ 45.26 $ 30.67 $ 25.99
Purchase Price Of Common Stock As a Percentage of Fair Market Value 95.00%    
Total number of shares reserved for issuance 1,200,000    
Number of Shares Available for Grant 414,275    
Employee Stock Purchase Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum Percentage Of Payroll Deductions Related To Purchase Of Common Stock 15.00%    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 931,000    
Weighted average period of recognized term 2 years 6 months    
Vested Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense $ 8,443,000 $ 8,331,000 $ 6,181,000
Vested Restricted Stock Awards | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of annual bonus settled with fully vested restricted stock unit awards 40.00%    
Unvested Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense $ 7,653,000 7,075,000 6,583,000
Recipient age to expense award on grant date 59 years 6 months    
Unrecognized compensation cost $ 8,681,000    
Weighted average period of recognized term 2 years 6 months    
2008 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total number of shares reserved for issuance 11,856,300    
Number of Shares Available for Grant 2,472,419    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense $ 897,000 $ 749,000 $ 569,000
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [1] $ 40.61    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value $ 49.92    
[1] Does not include employee stock purchase plans or stock option plans.