Fair Value Measurements (Carrying and Estimated Fair Values within Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Assets
Receivables, Fair Value Disclosure	$ 179,765	$ 177,602
Mortgage loans, net	592,630	579,767
Other investments	12,641	18,917
Total	785,036	776,286
Liabilities
Notes, loans and leases payable, gross	6,371,562	5,850,346
Total	6,371,562	5,850,346
Level 2 [Member]
Liabilities
Notes, loans and leases payable, gross	6,371,562	5,850,346
Total	6,371,562	5,850,346
Level 3 [Member]
Assets
Receivables, Fair Value Disclosure	179,765	177,602
Mortgage loans, net	592,630	579,767
Other investments	12,641	18,917
Total	785,036	776,286
Carrying Value [Member]
Assets
Receivables, Fair Value Disclosure	179,765	177,602
Mortgage loans, net	623,042	604,481
Other investments	12,641	18,917
Total	815,448	801,000
Liabilities
Notes, loans and leases payable, gross	6,794,502	6,304,038
Total	$ 6,794,502	$ 6,304,038