Leases (Maturities Of Lease Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Finance Lease Liabilities Payments Due [Abstract]
2022	$ 155,818
2023	129,840
2024	87,728
2025	62,633
2026	20,956
Thereafter	0
Total lease payments	456,975
Less: imputed interest	(30,820)
Financing lease liability	426,155
Operating Lease Liabilities Payments Due [Abstract]
2022	24,757
2023	22,610
2024	17,921
2025	6,045
2026	3,135
Thereafter	60,834
Total lease payments	135,302
Less: inputed interest	(50,103)
Operating lease liability	$ 85,199	$ 92,510