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Income Taxes - Narrative (Detail)
 3 Months Ended 12 Months Ended
Dec. 30, 2017
USD ($)
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 31, 2018
property
Subsequent Event [Line Items]          
Reduction in deferred tax asset     $ 28,800,000    
Adjustment to deferred tax asset valuation allowance     28,600,000    
Deferred income tax expense     200,000    
Release of valuation allowance on AMT credits     800,000    
Reclassification of AMT credit carryforward     800,000    
Partial release of valuation allowance $ (53,500,000) $ 0 (53,450,000)    
Deferred tax assets, valuation allowance 10,415,000 12,348,000 10,415,000 $ 97,552,000  
Unrecognized tax benefits, if recognized, would reduce effective tax rate 200,000 5,500,000 200,000    
Additions for tax positions in prior years   6,663,000 0 $ 0  
Unrecognized tax benefits, interest accrued 0 900,000 0    
Unrecognized tax benefits, penalties accrued $ 0 0 $ 0    
Decrease in unrecognized tax benefits is reasonably possible   1,100,000      
Goodwill          
Subsequent Event [Line Items]          
Unrecognized tax benefits, interest accrued   600,000      
Interest Expense          
Subsequent Event [Line Items]          
Unrecognized tax benefits, interest accrued   $ 300,000      
Sales-leaseback of four distribution centers          
Subsequent Event [Line Items]          
Number of properties subject to sale-leaseback arrangement | property         4