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CREDIT AGREEMENT (Details)
Apr. 30, 2020
USD ($)
Oct. 31, 2019
USD ($)
Mar. 21, 2019
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility, maximum borrowing capacity     $ 1,000,000,000.0
Long-term debt $ 200,000,000 $ 55,000,000  
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 999,200,000    
Long-term debt 200,000,000.0    
Revolving credit facility, remaining available balance 776,900,000    
Line of credit | Letter of Credit      
Debt Instrument [Line Items]      
Long-term debt $ 23,100,000