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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Debt Instrument [Line Items]      
Total principal payments due $ 4,230,000,000 $ 2,637,500,000  
Premium on notes 4,921,000 5,405,000  
Debt issuance costs (39,237,000) (28,027,000)  
Total amount outstanding 4,195,684,000 2,614,878,000  
Less:      
Current portion of long-term debt (note 11) 610,000,000 10,000,000  
Non-current portion of long-term debt 3,585,684,000 2,604,878,000  
Term Loan B      
Debt Instrument [Line Items]      
Total principal payments due 980,000,000 987,500,000  
Less:      
Current portion of long-term debt (note 11) 10,000,000 10,000,000  
Senior Notes | Senior Notes 2030      
Debt Instrument [Line Items]      
Total principal payments due 900,000,000 0  
Senior Notes | Senior Notes 2028      
Debt Instrument [Line Items]      
Total principal payments due 900,000,000 0  
Senior Notes | Senior Notes 2026      
Debt Instrument [Line Items]      
Total principal payments due 850,000,000 850,000,000  
Senior Notes | Senior Notes 2023      
Debt Instrument [Line Items]      
Total principal payments due 0 800,000,000  
Revolver | Line of Credit      
Debt Instrument [Line Items]      
Total principal payments due 600,000,000 0 $ 0
Less:      
Current portion of long-term debt (note 11) $ 600,000,000 $ 0