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Stock-Based Compensation Arrangements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Jul. 01, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     2,262,680 2,349,288
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 9.17 $ 9.00 [1]
ShareBasedCompensationArrangementbyShareBasedPaymentAwarad,Options,Outstanding,WeightedAverageRemainingContractualLife     6 years 2 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 132  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     2 years 9 months 7 days  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 13.73      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     (7,745)  
Share-based Compensation Arrangement by Share-bassed Payment Award, Options, Exercised, Weighted Average Exercise Price [1]   $ 9.96    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price     $ 9.40  
ShareBasedCompensationArrangementbyShareBasedPaymentAward,Options,ExpectedtoVest,WeightedAverageRemainingContractualTerm     6 years 3 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value     $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares     (191,632)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price [1] $ 9.58      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number     1,573,236  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options     514,639  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price     $ 8.41  
ShareBasedCompensationArrangementbyShareBasedPaymentAward,Options,Exercisable,WeightedAverageRemainingContractualLife     5 years 9 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     $ 423  
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (shares)     112,769  
[1] The weighted average exercise price reflects the original grant date fair value per option as adjusted for the dividend payment made in August 2015.