Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)	6 Months Ended
Sep. 30, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Less current portion	$ (30,488,000)	$ (278,779,000)
Long-term debt	4,983,737,000	4,710,294,000
Senior Notes due March 1, 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	1,317,305,000	997,772,000
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 doscount	$ 7,695,000	$ 2,228,000
Effective interest rate	5.90%	5.80%
Senior Amortizing Notes due June 30, 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 28,058,000	$ 35,431,000
Debt instrument, face amount	$ 47,367,000	47,367,000
Maturity date	Jun. 30, 2022
Unamortized doscount	$ 535,000	$ 842,000
Effective interest rate	7.44%	7.44%
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,038,000	$ 23,413,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	3,648,824,000	3,682,457,000
Debt instrument, face amount	$ 5,100,000,000	5,100,000,000
Maturity date	Mar. 01, 2024
Unamortized doscount	$ 109,426,000	$ 125,793,000
Effective interest rate	4.42%	4.42%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		$ 250,000,000
Debt instrument, face amount	$ 785,000,000	$ 785,000,000
Maturity date	Jul. 03, 2024
Weighted average interest rate		3.25%

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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Weighted average interest rate of debt outstanding.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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