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Fair Value Measurements (Carrying and Estimated Fair Values within Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Assets
Receivables, Fair Value Disclosure	$ 196,736	$ 195,710
Mortgage loans, net	657,019	639,162
Other investments	12,063	11,868
Total	865,818	846,740
Liabilities
Notes, loans and leases payable, gross	6,739,456	6,703,510
Liabilities Related to Investment Contracts, Fair Value Disclosure	2,471,703	2,436,537
Financial Liabilities Fair Value Disclosure, Total	9,211,159	9,140,047
Level 2 [Member]
Liabilities
Notes, loans and leases payable, gross	6,739,456	6,703,510
Financial Liabilities Fair Value Disclosure, Total	6,739,456	6,703,510
Level 3 [Member]
Assets
Receivables, Fair Value Disclosure	196,736	195,710
Mortgage loans, net	657,019	639,162
Other investments	12,063	11,868
Total	865,818	846,740
Liabilities
Liabilities Related to Investment Contracts, Fair Value Disclosure		2,436,537
Financial Liabilities Fair Value Disclosure, Total		2,436,537
Carrying Value [Member]
Assets
Receivables, Fair Value Disclosure	196,736	195,710
Mortgage loans, net	664,551	657,567
Other investments	12,063	11,868
Total	873,350	865,145
Liabilities
Notes, loans and leases payable, gross	7,285,130	7,229,341
Liabilities Related to Investment Contracts, Fair Value Disclosure	2,531,459	2,502,729
Financial Liabilities Fair Value Disclosure, Total	$ 9,816,589	$ 9,732,070

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