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CREDIT AGREEMENT (Details)
May 29, 2019
USD ($)
Apr. 30, 2019
USD ($)
Mar. 21, 2019
USD ($)
Oct. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity     $ 1,000,000,000.0  
Long-term debt   $ 100,000,000   $ 0
Line of credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Ratio of indebtedness to net capital     0.50  
Ratio of indebtedness to net capital, maximum increase     0.05  
Revolving credit facility, minimum net worth requirement   970,400,000    
Long-term debt   100,000,000.0    
Revolving credit facility, remaining available balance   874,700,000    
Line of credit | Letter of Credit        
Debt Instrument [Line Items]        
Long-term debt   $ 25,300,000    
Subsequent Event | Line of credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt $ 80,000,000.0      
Revolving credit facility, remaining available balance 894,700,000      
Subsequent Event | Line of credit | Letter of Credit        
Debt Instrument [Line Items]        
Long-term debt $ 25,300,000