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Long-Term Debt (Tables)
 6 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consists of the following, as of the dates indicated:

(In thousands, except percentages)September 30, 2023March 31, 2023
2021 Senior Notes bearing interest at 3.750%, with interest payable on April 1 and October 1 of each year. The 2021 Senior Notes mature on April 1, 2031.
$600,000 $600,000 
2019 Senior Notes bearing interest at 5.125%, with interest payable on January 15 and July 15 of each year. The 2019 Senior Notes mature on January 15, 2028.
400,000 400,000 
2012 Term B-5 Loans bearing interest at the Borrower's option at either LIBOR plus a margin of 2.00%, with a LIBOR floor of 0.50%, or an alternate base rate plus a margin of 1.00% per annum (at March 31, 2023) and SOFR plus a margin of 2.00% plus a credit spread adjustment (at September 30, 2023), due on July 1, 2028.
275,000 360,000 
Long-term debt1,275,000 1,360,000 
Less: unamortized debt costs(12,028)(14,212)
Long-term debt, net$1,262,972 $1,345,788 
Aggregate Future Principal Payments As of September 30, 2023, aggregate future principal payments required in accordance with the terms of the 2012 Term B-5 Loans under the 2012 Term Loan, the 2012 ABL Revolver and the indentures governing the senior unsecured notes due 2031 (the "2021 Senior Notes") and the senior unsecured notes due 2028 (the "2019 Senior Notes") are as follows:
(In thousands)
Year Ending March 31,Amount
2024 (remaining six months ending March 31, 2024)$— 
2025— 
2026— 
2027— 
2028400,000 
Thereafter875,000 
$1,275,000