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Stock-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
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, Vested in Period, Fair Value $ 25,600,000 $ 23,200,000 $ 21,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 57.08 $ 40.61 $ 29.50
Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term 10 years    
Total intrinsic value of options exercised $ 9,651,000 $ 0 $ 1,461,000
Weighted average fair value of options granted $ 15.16 $ 10.59 $ 8.09
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%    
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 2,121,786    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total number of shares reserved for issuance 1,200,000    
Number of Shares Available for Grant 386,628    
Weighted average purchase price $ 60.32 $ 45.26 $ 30.67
Purchase Price Of Common Stock As a Percentage of Fair Market Value 95.00%    
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%    
Vested Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation, holding period 4 years    
Stock based compensation expense $ 8,756,000 $ 8,443,000 $ 8,331,000
Unvested Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation, vesting period 4 years    
Stock based compensation expense $ 8,127,000 7,653,000 7,075,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [1] $ 57.08    
Unrecognized compensation cost $ 9,338,000    
Weighted average period of recognized term 2 years 6 months    
Unvested Restricted Stock [Member] | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recipient age to expense award on grant date 59 years 6 months    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation, vesting period 4 years    
Stock based compensation expense $ 583,000 $ 897,000 $ 749,000
Unrecognized compensation cost $ 1,107,000    
Weighted average period of recognized term 2 years 4 months 24 days    
[1] Does not include employee stock purchase plans or stock option plans.