Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Sep. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 1,620,000	$ 1,495,000
Current portion of long-term debt	6,000	0
Long-term debt, net	1,614,000	1,495,000
Less: unamortized debt costs	(21,019)	(15,347)
Long-term debt, net	1,592,981	1,479,653
2012 ABL Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 20,000	0
Senior Notes \| 2021 Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.75%
Total long-term debt (including current portion)	$ 600,000	600,000
Senior Notes \| 2019 Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.125%
Total long-term debt (including current portion)	$ 400,000	400,000
Term B-5 Loans \| 2012 Senior Notes
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 0	495,000
Term B-5 Loans \| 2012 Senior Notes \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Debt instrument, variable rate, minimum	0.00%
Term B-5 Loans \| 2012 Senior Notes \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Debt instrument, variable rate, minimum	1.00%
Term B-5 Loans \| 2012 ABL Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 600,000	$ 0
Term B-5 Loans \| 2012 ABL Revolver \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Debt instrument, variable rate, minimum	0.50%
Term B-5 Loans \| 2012 ABL Revolver \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%

Debt Instrument, Variable Rate, Minimum

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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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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