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CREDIT AGREEMENT (Detail)
Feb. 25, 2019
USD ($)
Jan. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Jun. 14, 2018
USD ($)
Nov. 22, 2017
USD ($)
Debt Instrument [Line Items]          
Revolving credit facility, maximum borrowing capacity       $ 900,000,000.0  
Long-term debt   $ 60,000,000 $ 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   130,000,000      
Line of credit | 2018          
Debt Instrument [Line Items]          
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]          
Ratio of indebtedness to net capital       0.50  
Revolving credit facility, maximum debt to total capitalization ratio (as percent)       0.05  
Revolving credit facility, minimum net worth requirement   1,031,300,000      
Long-term debt   60,000,000      
Revolving credit facility, remaining available balance   814,700,000      
Line of credit | Letter of Credit          
Debt Instrument [Line Items]          
Long-term debt   $ 25,300,000      
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       $ 250,000,000  
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  
Subsequent Event | Line of credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term debt $ 100,000,000        
Revolving credit facility, remaining available balance 774,700,000        
Subsequent Event | Line of credit | Letter of Credit          
Debt Instrument [Line Items]          
Long-term debt $ 25,300,000