Long-term Debt (Detail Textual) - USD ($)	6 Months Ended
	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Outstanding amount under Credit Facility	$ 1,426,095,000	$ 1,413,555,000
Interest Rate Swap | Cash Flow Hedging
Debt Instrument [Line Items]
Aggregate notional amount	800,000,000.0
Bank Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 2,438,400,000
Outstanding borrowings interest rate	2.49%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,500,000,000.0
Outstanding amount under Credit Facility	605,000,000	569,000,000
Term loans
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	938,400,000
Outstanding amount under Credit Facility	$ 821,095,000	$ 844,555,000
Term loan period	5 years
Loan maturity date	Jun. 30, 2024
Term loan frequency of payment	quarterly
Term loan principal payment	$ 11,700,000
Same-Day Swing Line Loan Revolving Credit Sub-Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	100,000,000.0
Outstanding amount under Credit Facility	0
Stand-By Letters Of Credit Revolving Credit Sub-Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 25,000,000.0