Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 1,275,000
Long-term debt, net	1,275,000	$ 1,360,000
Less: unamortized debt costs	(12,028)	(14,212)
Long-term debt, net	$ 1,262,972	1,345,788
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 Loans \| 2012 Term B-5 Loans
Debt Instrument [Line Items]
Total long-term debt (including current portion)	$ 275,000	$ 360,000
Term Loans \| 2012 Term B-5 Loans \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%
Debt instrument, variable rate, minimum		0.50%
Term Loans \| 2012 Term B-5 Loans \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
Term Loans \| 2012 Term B-5 Loans \| SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%

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