Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Feb. 04, 2021	Apr. 09, 2019	Feb. 22, 2017	Oct. 24, 2016
Long-Term Debt
Face amount	$ 3,395,829	$ 3,376,768
Face amount, long-term	3,393,451	3,374,585
LONG-TERM DEBT, debt issuance costs	(42,988)	(55,555)
Debt issuance costs, current, net	0	0
Debt issuance costs, noncurrent, net	(42,988)	(55,555)
Book value	3,352,841	3,321,213
Current maturities of long-term debt	2,378	2,183
LONG-TERM DEBT, net of debt issuance costs and current maturities	$ 3,350,463	3,319,030
7.5% Senior Secured Notes due 2026
Long-Term Debt
Fixed interest rate	7.50%		7.50%
Face amount	$ 2,050,000	2,050,000
LONG-TERM DEBT, debt issuance costs	(35,140)	(44,246)
Book value	2,014,860	2,005,754
Asset Based Credit Facility
Long-Term Debt
Face amount	116,000	4,000
LONG-TERM DEBT, debt issuance costs	0	0
Book value	$ 116,000	4,000
7.5% Senior Notes due 2023
Long-Term Debt
Fixed interest rate	7.50%					7.50%
Face amount	$ 475,702	555,251
LONG-TERM DEBT, debt issuance costs	(1,873)	(3,564)
Book value	$ 473,829	551,687
6.125% Senior Notes due 2025
Long-Term Debt
Fixed interest rate	6.125%				6.125%
Face amount	$ 380,020	380,020
LONG-TERM DEBT, debt issuance costs	(2,456)	(3,297)
Book value	$ 377,564	376,723
7.5% Senior Notes due 2026
Long-Term Debt
Fixed interest rate	7.50%			7.50%
Face amount	$ 332,402	338,402
LONG-TERM DEBT, debt issuance costs	(3,460)	(4,378)
Book value	328,942	334,024
Other long-term debt
Long-Term Debt
Face amount	41,705	49,095
LONG-TERM DEBT, debt issuance costs	(59)	(70)
Book value	$ 41,646	$ 49,025