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Performance-Contingent Restricted Stock Awards (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 14, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at Vesting $ 492  
Fiscal Year Vested 2018 | 2016 Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at Vesting 405  
Income tax expense related to share-based payments (2,130)  
Fair Value at Vesting $ 6,504  
Fiscal Year Vested 2018 | TSR Modifier | 2016 Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Increase/(Decrease) (333,112)  
Fiscal Year Vested 2018 | ROIC Modifier | 2016 Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Increase/(Decrease) (114,190)  
Fiscal Year Vested 2017 | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at Vesting   $ 392
Income tax expense related to share-based payments   (3,099)
Fair Value at Vesting   $ 6,316
Fiscal Year Vested 2017 | TSR Modifier | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Increase/(Decrease)   (378,219)
Fiscal Year Vested 2017 | ROIC Modifier | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Increase/(Decrease)   (49,272)