Fair Value Measurements (Carrying and Estimated Fair Values within Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Assets
Receivables, Fair Value Disclosure	$ 154,846	$ 146,736
Mortgage loans, net	531,880	444,957
Other investments	83,674	109,009
Total	770,400	700,702
Liabilities
Notes, loans and leases payable, gross	6,051,219	5,710,735
Total	6,051,219	5,710,735
Level 2 [Member]
Liabilities
Notes, loans and leases payable, gross	6,051,219	5,710,735
Total	6,051,219	5,710,735
Level 3 [Member]
Assets
Receivables, Fair Value Disclosure	154,846	146,736
Mortgage loans, net	531,880	444,957
Other investments	83,674	109,009
Total	770,400	700,702
Carrying Value [Member]
Assets
Receivables, Fair Value Disclosure	154,846	146,736
Mortgage loans, net	567,784	466,531
Other investments	83,674	109,009
Total	806,304	722,276
Liabilities
Notes, loans and leases payable, gross	6,471,405	6,143,350
Total	$ 6,471,405	$ 6,143,350