Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Cash flow from operating activities:
Net earnings	$ 922,998	$ 1,123,286	$ 610,856
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	733,879	696,955	664,001
Amortization of deferred policy acquisition costs	27,924	33,854	28,293
Amortization of premiums and accretion of discounts related to investments, inc	20,066	19,749	14,229
Amortization of debt issuance costs	7,087	5,659	5,948
Interest credited to policyholders	55,822	64,692	55,321
Change in allowance for losses on trade receivables	(4,860)	4,227	1,206
Change in allowance for inventory reserves	9,490	15,235	1,298
Net gains on disposal of personal property	(247,084)	(214,203)	(54,071)
Net gains on disposal of real estate	5,596	(4,120)	3,281
Net gains on sales of investments	8,300	(11,872)	(10,058)
Net (gains) losses on equity investments	9,091	(7,837)	(394)
Deferred income taxes	131,754	101,091	68,411
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	44,714	(9,187)	(39,516)
Inventories and parts	(2,225)	(68,536)	(5,775)
Prepaid expenses	(5,575)	232,342	94,359
Capitalization of deferred policy acquisition costs	(25,202)	(32,626)	(36,162)
Other assets	16,027	15,349	44,251
Related party assets	(544)	(10,357)	(487)
Accounts payable and accrued expenses	34,263	10,514	78,718
Policy benefits and losses, claims and loss expenses payable	(13,708)	(19,692)	(1,992)
Other policyholders' funds and liabilities	(2,580)	(1,608)	2,230
Deferred income	5,137	5,399	11,388
Related party liabilities	(760)	(2,079)	60
Net cash provided by operating activities	1,729,610	1,946,235	1,535,395
Cash flow from investing activities:
Escrow deposits	9,298	(9,328)	(5,221)
Purchase of:
Property, plant and equipment	(2,723,901)	(2,136,537)	(1,441,475)
Short term investments	(60,037)	(74,418)	(69,929)
Fixed maturities investments	(563,452)	(627,326)	(606,233)
Equity Securities	(4,932)	(19,299)	(962)
Preferred stock	0	(8,000)	(16,144)
Real estate	(8,685)	(261)	(622)
Mortgage loans	(204,579)	(158,147)	(158,071)
Proceeds from sale and paydowns of:
Property, plant and equipment	701,331	623,235	537,484
Short term investments	74,457	51,591	69,718
Fixed maturities investments	196,635	360,937	529,239
Equity Securities	1,286	2,046	207
Preferred stock	0	2,000	2,700
Real estate	0	113	255
Mortgage loans	161,194	126,218	29,525
Net cash used by investing activities	(2,421,385)	(1,867,176)	(1,129,529)
Cash flow from financing activities:
Borrowings from credit facilities	1,017,898	1,969,474	922,008
Principal repayments on credit facilities	(801,994)	(437,506)	(662,588)
Debt issuance costs	(5,237)	(13,156)	(5,793)
Capital lease payments	(124,188)	(166,262)	(221,247)
Securitization deposits	217	0	0
Voting Common stock dividends paid	(19,608)	(29,412)	(49,019)
Series N Non-Voting Common Stock Dividends	(14,117)	0	0
Investment contract deposits	341,483	347,520	517,856
Investment contract withdrawals	(334,659)	(237,503)	(213,864)
Net cash provided by financing activities	59,795	1,433,155	287,353
Effects of exchange rate on cash	(11,633)	(2,089)	6,441
Increase (decrease) cash and cash equivalents	(643,613)	1,510,125	699,660
Cash and cash equivalents at beginning of period	2,704,137	1,194,012	494,352
Cash and cash equivalents at the end of period	$ 2,060,524	$ 2,704,137	$ 1,194,012