Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)	9 Months Ended
Dec. 31, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Less current portion	$ (15,009,000)	$ (27,339,000)
Long-term debt, excluding current portion	4,572,865,000	4,734,775,000
Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	1,319,284,000	1,318,079,000
Debt instrument, face amount	$ 1,325,000,000	$ 1,325,000,000
Stated interest rate	5.75%	5.75%
Maturity date	Mar. 01, 2025
Unamortized discount	$ 5,716,000	$ 6,921,000
Effective interest rate	5.90%	5.90%
Senior Amortizing Notes due June 30, 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 8,390,000	$ 20,345,000
Debt instrument, face amount	$ 47,367,000	47,367,000
Maturity date	Jun. 30, 2022
Unamortized discount	$ 60,000	$ 293,000
Effective interest rate	7.44%	7.44%
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 9,645,000	$ 18,138,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	3,250,555,000	3,405,552,000
Debt instrument, face amount	$ 5,100,000,000	5,100,000,000
Maturity date	Mar. 01, 2024
Unamortized discount	$ 62,695,000	$ 87,698,000
Effective interest rate	4.42%	4.42%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt
Debt instrument, face amount	$ 785,000,000	$ 785,000,000
Maturity date	Jul. 03, 2024

Face (par) amount of debt instrument at time of issuance.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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