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Long-Term Debt (Tables)
 12 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consists of the following, as of the dates indicated:

(In thousands, except percentages)March 31,
2021		March 31,
2020
2016 Senior Notes bearing interest at 6.375%, with interest payable on March 1 and September 1 of each year. The 2016 Senior Notes mature on March 1, 2024.
$— $600,000 
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 — 
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 0.00%, or an alternate base rate plus a margin of 1.00%, with a floor of 1.00%, due on January 26, 2024.
495,000 690,000 
2012 ABL Revolver bearing interest at the Borrower's option at either a base rate plus applicable margin or LIBOR plus applicable margin. Any unpaid balance is due on December 11, 2024.— 55,000 
Long-term debt1,495,000 1,745,000 
Less: unamortized debt costs(15,347)(14,700)
Long-term debt, net$1,479,653 $1,730,300 
Schedule of Future Principal Payments
As of March 31, 2021, aggregate future principal payments required in accordance with the terms of the 2012 Term Loan, 2012 ABL Revolver and the indentures governing the 2021 Senior Notes and the 2019 Senior Notes are as follows:

(In thousands)
Year Ending March 31,Amount
2022$— 
2023— 
2024495,000 
2025— 
2026— 
Thereafter1,000,000 
$1,495,000