Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.8.0.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 6,878,000      
Common stock options available for grant (in shares) 45,445.418     44,021.264
Dividend yield (as a percent) 0.00%      
Expected volatility (as a percent) 31.50%      
Fair value of option $ 351.61      
Additional share based compensation from modification $ 687,000      
Stock-based compensation expense 2,484,000 $ 2,280,000 $ 1,290,000  
Stock based compensation     1,290,000  
Unrecognized compensation expense for unvested options $ 3,016,000      
Weighted average period required for recognition of compensation expense 1 year 8 months      
Awards granted (in shares) 425      
Deferred stock units right to receive a cash payment $ 289,000 719,000 678,000  
Additional Paid-in Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation $ 2,484,000 $ 2,280,000    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate (as a percent) 1.27%      
Expected term 5 years 9 months      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate (as a percent) 2.26%      
Expected term 6 years 3 months      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 43,532.660 43,375.418    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares 8,562.758      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 8,720.000      
Stock-based compensation expense $ 1,984,000 $ 1,513,000 957,000  
Time Based Vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 23,126.492      
Performance Based Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 20,406.168      
Stock-based compensation expense $ 0      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 1,600      
Allocated Share-based Compensation Expense $ 500,000 $ 767,000 $ 333,000  
Restricted Stock | Tranches 1 and 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 1,500      
Award vesting period 2 years      
Restricted Stock | Tranche 3        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 100      
Award vesting period 1 year      
Restricted Stock | 2014 Equity Incentive Plan | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent) 50.00%      
Restricted Stock | 2014 Equity Incentive Plan | Tranche 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting (as a percent) 50.00%