Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Cash flow from operating activities:
Net Income (Loss)	$ 628,707	$ 924,472	$ 1,124,362
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	817,889	733,879	696,955
Amortization of premiums and accretion of discounts related to investments, net	16,849	20,066	19,749
Amortization of debt issuance costs	6,712	7,087	5,659
Interest credited to policyholders	71,433	55,822	64,692
Provision for allowance (recoveries) for losses on trade receivables, net	2,447	4,860	4,227
Proceeds from Fees Received	23,926	22,432	21,662
Net gains on disposal of personal property	(153,958)	(247,084)	(214,203)
Net (gains) losses on disposal of real estate	7,914	5,596	4,120
Net (gains) losses on sales of investments	(157)	(8,300)	(11,872)
Net (gains) losses on equity investments	(5,741)	(9,091)	(7,837)
Deferred income taxes, net	98,379	131,754	101,091
Net change in other operating assets and liabilities:
Trade receivables and reinsurance recoverables	(29,011)	(44,714)	(9,187)
Inventories and parts, net	(518)	(7,265)	(53,301)
Prepaid expenses	(4,451)	(5,575)	(232,342)
Capitalization of deferred policy acquisition costs	(7,239)	(2,722)	(1,228)
Other assets and Right of use assets - operating, net	(9,889)	(6,405)	(6,313)
Related party assets	(9,614)	(544)	(10,357)
Accounts payable and accrued expenses and operating lease liabilties	10,697	34,263	10,514
Increase (Decrease) in Other Insurance Liabilities	39,204	15,182	20,768
Other policyholders' funds and liabilities	9,922	2,580	1,608
Deferred income	2,085	5,137	5,399
Related party liabilities	5,850	760	2,079
Net cash provided by operating activities	1,452,756	1,729,610	1,946,235
Cash flow from investing activities:
Escrow deposits	(2,983)	(9,298)	(9,328)
Purchase of:
Property, plant and equipment	(2,992,898)	(2,723,901)	(2,136,537)
Fixed maturity securities available-for-sale	(344,166)	(623,489)	(701,744)
Equity securities	(530)	(4,932)	(27,299)
Investments other	(174,967)	(213,264)	(158,408)
Proceeds from sale and paydowns of:
Property, plant and equipment	739,178	701,331	623,235
Fixed maturity securities available-for-sale	672,121	271,092	412,528
Equity securities	1,417	1,286	4,046
Investments, other	50,489	161,194	126,331
Net cash used by investing activities	2,046,373	2,421,385	1,867,176
Cash flow from financing activities:
Borrowings from credit facilities	1,186,363	1,017,898	1,969,474
Principal repayments on credit facilities	(919,771)	(801,994)	(437,506)
Payment of debt issuance costs	(4,082)	(5,237)	(13,156)
Finance lease payments	(105,564)	(124,188)	(166,262)
Securitization deposits	(319)	(217)	0
Common stock dividends paid	0	(19,608)	(29,412)
Series N Non-Voting Common Stock Dividends	(31,765)	(14,117)	0
Investment contract deposits	360,124	341,483	347,520
Investment contract withdrawals	(419,091)	(334,659)	(237,503)
Net cash provided by financing activities	66,533	59,795	1,433,155
Effects of exchange rate on cash	1,104	11,633	2,089
Increase (decrease) cash and cash equivalents	525,980	643,613	1,510,125
Cash and cash equivalents at the beginning of period	2,060,524	2,704,137	1,194,012
Cash and cash equivalents at the end of period	$ 1,534,544	$ 2,060,524	$ 2,704,137