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Debt - Additional Information (Detail)
6 Months Ended
Jun. 29, 2018
USD ($)
Financial_Institution
Jul. 31, 2020
USD ($)
Aug. 01, 2020
USD ($)
Jun. 08, 2020
USD ($)
Jun. 07, 2020
USD ($)
Apr. 30, 2020
USD ($)
Line of Credit Facility [Line Items]            
Line of credit outstanding   $ 120,000,000       $ 220,000,000
Other (Loss) Income, Net            
Line of Credit Facility [Line Items]            
Interest expense   1,976,000        
Stand-by letters of credit            
Line of Credit Facility [Line Items]            
Letter of credit outstanding   13,399,000        
Trade Letter of Credit            
Line of Credit Facility [Line Items]            
Letter of credit outstanding   53,389,000        
Number of financial institutions with borrowing agreements | Financial_Institution 2          
Line of credit facility available for purposes of trade of letter of credit       $ 95,000,000 $ 130,000,000  
Line of credit facility, available amount   $ 41,611,000        
Trade Letter of Credit | Subsequent Event            
Line of Credit Facility [Line Items]            
Line of credit facility available for purposes of trade of letter of credit     $ 70,000,000      
JPMorgan Chase Bank N. A. | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Credit agreement initiation date Jun. 29, 2018          
Credit facility maturity date 2023-06          
Credit facility maximum borrowing capacity $ 350,000,000          
Additional line of credit facility $ 150,000,000          
Commitment fee percentage 0.20%          
JPMorgan Chase Bank N. A. | Revolving Credit Facility | Adjusted LIBOR, CDOR or EURIBOR | Minimum            
Line of Credit Facility [Line Items]            
Applicable margin 1.125%          
JPMorgan Chase Bank N. A. | Revolving Credit Facility | Adjusted LIBOR, CDOR or EURIBOR | Maximum            
Line of Credit Facility [Line Items]            
Applicable margin 1.375%          
JPMorgan Chase Bank N. A. | Revolving Credit Facility | Adjusted ABR | Minimum            
Line of Credit Facility [Line Items]            
Applicable margin 0.125%          
JPMorgan Chase Bank N. A. | Revolving Credit Facility | Adjusted ABR | Maximum            
Line of Credit Facility [Line Items]            
Applicable margin 0.375%