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CREDIT AGREEMENT (Detail)
Apr. 28, 2017
USD ($)
Apr. 30, 2018
USD ($)
Debt Instrument [Line Items]    
Revolving credit facility, maximum borrowing capacity $ 900,000,000.0  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility, permitted carry over of capital expenditure limitation   $ 20,000,000
Revolving credit facility, annual capital expenditure limitations   125,000,000
Line of credit    
Debt Instrument [Line Items]    
Increase in debt to total capitalization ratio (as percent) 5.00%  
Line of credit | 2018    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation $ 105,000,000.0  
Revolving credit facility, permitted carry over of capital expenditure limitation   20,000,000.0
Line of credit | 2019    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation 110,000,000.0  
Line of credit | 2020    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation 115,000,000.0  
Line of credit | 2021    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation 120,000,000.0  
Line of credit | 2022    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation $ 125,000,000.0  
Line of credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility, maximum debt to total capitalization ratio (as percent) 0.50  
Revolving credit facility, minimum net worth requirement   1,028,200,000
Revolving credit facility, outstanding borrowings   0
Revolving credit facility, remaining available balance   876,500,000
Line of credit | Letter of Credit    
Debt Instrument [Line Items]    
Revolving credit facility, outstanding borrowings   $ 23,500,000
Construction expenditure limitation | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility, construction expenditure limitation $ 135,000,000.0  
Construction expenditure limitation | Revolving Credit Facility | Tyler, Texas    
Debt Instrument [Line Items]    
Revolving credit facility, construction expenditure limitation 200,500,000.0  
Construction expenditure limitation | Revolving Credit Facility | Unknown City and State    
Debt Instrument [Line Items]    
Revolving credit facility, construction expenditure limitation 210,000,000.0  
Construction expenditure limitation | Revolving Credit Facility | Floowood, Mississippi    
Debt Instrument [Line Items]    
Revolving credit facility, construction expenditure limitation 15,000,000.0  
Processing Complex | Revolving Credit Facility | Unknown City and State    
Debt Instrument [Line Items]    
Revolving credit facility, construction expenditure limitation 60,000,000.0  
Aircraft expenditure | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility, capital expenditure limitation $ 70,000,000.0