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LONG-TERM DEBT - Additional Information (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 27, 2020
USD ($)
Dec. 24, 2019
USD ($)
$ / shares
May 30, 2018
USD ($)
Mar. 30, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Oct. 31, 2019
USD ($)
Apr. 04, 2017
USD ($)
Jan. 16, 2014
USD ($)
Debt Instrument [Line Items]                        
Long-term debt             $ 4,227,500,000 $ 2,637,500,000        
Revolver | Line of Credit                        
Debt Instrument [Line Items]                        
Long-term debt             $ 600,000,000 0        
Effective interest rate percentage             1.94%          
Leverage ratio, compliance maximum             4          
Leverage ratio             2.0          
Interest expense             $ 7,700,000 0 $ 9,000,000.0      
Credit agreement, maximum capacity             750,000,000     $ 450,000,000    
Proceeds from lines of credit       $ 600,000,000   $ 750,000,000 600,000,000   200,000,000      
Repayment of line of credit         $ 750,000,000       375,000,000.0      
Remaining borrowing capacity             $ 150,000,000          
Revolver | Line of Credit | LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Interest addition to floating rate             1.25%          
Revolver | Line of Credit | LIBOR | Maximum                        
Debt Instrument [Line Items]                        
Interest addition to floating rate             1.75%          
Notes due 2022 | Convertible Debt                        
Debt Instrument [Line Items]                        
Debt instrument face amount                     $ 143,800,000  
Debt instrument stated interest rate                     2.50%  
Incremental principal amount convertible $ 1,000 $ 1,000                    
Conversion price (in dollars per share) | $ / shares   $ 23.00                    
Conversion rate increase   7.7633                    
Conversion rate   46.4667                    
Total converted per $1,000 Principal   $ 1,068.7341                    
Long-term debt             $ 0          
Term Loan B                        
Debt Instrument [Line Items]                        
Debt instrument face amount     $ 1,000,000,000                 $ 800,000,000
Long-term debt             $ 977,500,000 987,500,000        
Proceeds from issuance of debt     $ 1,000,000,000                  
Term loan period             7 years          
Term loan quarterly repayment as percentage of principal             0.25%          
Effective interest rate percentage             1.92%          
Leverage ratio, compliance maximum             4          
Leverage ratio             2.0          
Interest expense             $ 33,300,000 $ 41,100,000 $ 27,900,000      
Term Loan B | LIBOR                        
Debt Instrument [Line Items]                        
Interest addition to floating rate             1.75%