Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)	6 Months Ended
Sep. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Less current portion	$ (19,152,000)	$ (27,339,000)
Long-term debt, excluding current portion	4,643,245,000	4,734,775,000
Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	1,318,876,000	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	$ 6,124,000	$ 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	$ 12,470,000	$ 20,345,000
Debt instrument, face amount	$ 47,367,000	47,367,000
Maturity date	Jun. 30, 2022
Unamortized discount	$ 120,000	$ 293,000
Effective interest rate	7.44%	7.44%
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 9,088,000	$ 18,138,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	3,321,963,000	3,405,552,000
Debt instrument, face amount	$ 5,100,000,000	5,100,000,000
Maturity date	Mar. 01, 2024
Unamortized discount	$ 71,287,000	$ 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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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