Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flow from operating activities:
Net earnings	$ 1,123,286	$ 610,856	$ 442,048
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	696,955	664,001	664,120
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Amortization of premiums and accretion of discounts related to investments, inc	19,749	14,229	13,317
Amortization of debt issuance costs	5,659	5,948	4,426
Interest credited to policyholders	64,692	55,321	51,857
Change in allowance for losses on trade receivables	4,227	1,206	(14)
Change in allowance for inventory reserves	15,235	1,298	640
Net gains on disposal of personal property	(214,203)	(54,071)	(27,057)
Net gains on disposal of real estate	(4,120)	3,281	(758)
Net gains on sales of investments	(11,872)	(10,058)	(13,596)
Net (gains) losses on equity investments	(7,837)	(394)	(3,783)
Deferred income taxes	101,091	68,411	317,893
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(9,187)	(39,516)	38,129
Inventories and parts	(68,536)	(5,775)	1,776
Prepaid expenses	232,342	94,359	(391,120)
Capitalization of deferred policy acquisition costs	(32,626)	(36,162)	(24,447)
Other assets	(2,706)	29,865	(1,295)
Related party assets	(10,357)	(487)	(5,645)
Accounts payable and accrued expenses	28,752	92,925	(4,530)
Policy benefits and losses, claims and loss expenses payable	(19,692)	(1,992)	(12,618)
Other policyholders' funds and liabilities	(1,608)	2,230	(4,857)
Deferred income	5,216	11,567	(1,818)
Related party liabilities	(2,079)	60	1,626
Net cash provided by operating activities	1,946,235	1,535,395	1,075,513
Cash flow from investing activities:
Escrow deposits	(9,328)	(5,221)	6,617
Purchase of:
Property, plant and equipment	(2,136,537)	(1,441,475)	(2,309,406)
Short term investments	(74,418)	(69,929)	(61,226)
Fixed maturities investments	(627,326)	(606,233)	(379,349)
Equity securities	(19,299)	(962)	(83)
Preferred stock	(8,000)	(16,144)	0
Real estate	(261)	(622)	(4,286)
Mortgage loans	(158,147)	(158,071)	(62,016)
Proceeds from sale and paydowns of:
Property, plant and equipment	623,235	537,484	687,375
Short term investments	51,591	69,718	59,056
Fixed maturities investments	360,937	529,239	268,636
Equity securities	2,046	207	185
Preferred stock	2,000	2,700	2,375
Real estate	113	255	311
Mortgage loans	126,218	29,525	25,162
Net cash used by investing activities	(1,867,176)	(1,129,529)	(1,766,649)
Cash flow from financing activities:
Borrowings from credit facilities	1,969,474	922,008	1,121,412
Principal repayments on credit facilities	(437,506)	(662,588)	(349,986)
Debt issuance costs	(13,156)	(5,793)	(5,332)
Capital lease payments	(166,262)	(221,247)	(307,782)
Employee stock ownership plan value	0	0	(206)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Investment contract deposits	347,520	517,856	234,640
Investment contract withdrawals	(237,503)	(213,864)	(151,022)
Net cash provided by financing activities	1,433,155	287,353	512,320
Effects of exchange rate on cash	(2,089)	6,441	(533)
Increase (decrease) cash and cash equivalents	1,510,125	699,660	(179,349)
Cash and cash equivalents at the beginning of period	1,194,012	494,352	673,701
Cash and cash equivalents at the end of the period	$ 2,704,137	$ 1,194,012	$ 494,352