Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Cash flow from operating activities:
Net earnings	$ 442,048	$ 370,857	$ 790,583
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	664,120	581,025	555,069
Amortization of deferred policy acquisition costs	31,219	28,556	24,514
Amortization of premiums and accretion of discounts related to investments, net	13,317	13,107	12,790
Amortization of debt issuance costs	4,426	3,923	3,868
Interest credited to policyholders	51,857	35,387	32,302
Change in allowance for losses on trade receivables	(14)	52	(120)
Change in allowance for inventory reserves	640	(146)	5,065
Net gains on disposal of real estate	(758)	(44)	(195,414)
Net gains on sales of investments	(13,596)	(2,663)	(6,269)
Net losses on equity investments	(3,783)	5,739	0
Deferred income taxes	317,893	106,811	(193,434)
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	38,129	(31,365)	(15,329)
Inventories and parts	1,776	(13,492)	(12,384)
Prepaid expenses	(391,120)	(8,620)	(40,765)
Capitalization of deferred policy acquisition costs	(24,447)	(25,957)	(27,350)
Other assets	(1,295)	157,152	(165,968)
Related party assets	(5,645)	4,194	53,408
Accounts payable and accrued expenses	(4,530)	10,263	(36,980)
Policy benefits and losses, claims and loss expenses payable	(12,618)	(236,120)	161,121
Other policyholders' funds and liabilities	(4,857)	5,007	(109)
Deferred income	(1,818)	966	5,524
Related party liabilities	1,626	(2,067)	(616)
Net cash provided by operating activities	1,075,513	975,583	937,684
Cash flow from investing activities:
Escrow deposits	6,617	4,299	31,362
Purchase of:
Property, plant and equipment	(2,309,406)	(1,869,968)	(1,363,745)
Short term investments	(61,226)	(54,048)	(63,556)
Fixed maturities investments	(379,349)	(540,045)	(390,900)
Equity securities	(83)	(957)	(662)
Preferred stock	0	0	(1,000)
Real estate	(4,286)	(635)	(1,939)
Mortgage loans	(62,016)	(63,611)	(83,507)
Proceeds from sale and paydowns of:
Property, plant and equipment	687,375	606,271	699,803
Short term investments	59,056	66,037	67,790
Fixed maturities investments	268,636	123,551	163,469
Equity securities	185	8,608	0
Preferred stock	2,375	1,625	4,208
Real estate	311	0	2,783
Mortgage loans	25,162	147,737	37,590
Net cash used by investing activities	(1,766,649)	(1,571,136)	(898,304)
Cash flow from financing activities:
Borrowings from credit facilities	1,121,412	897,311	498,464
Principal repayments on credit facilities	(349,986)	(299,748)	(356,451)
Debt issuance costs	(5,332)	(7,243)	(5,111)
Capital lease payments	(307,782)	(303,431)	(296,363)
Employee stock ownership plan			(11,640)
Securitization deposits	0	0	(2,180)
Common stock dividends paid	(29,404)	(39,179)	(29,380)
Investment contract deposits	234,640	400,123	401,814
Investment contract withdrawals	(151,022)	(132,833)	(182,549)
Net cash provided by financing activities	512,320	514,582	16,604
Effects of exchange rate on cash	(533)	(4,716)	5,598
Increase (decrease) in cash and cash equivalents	(179,349)	(85,687)	61,582
Cash and cash equivalents at the beginning of period	673,701	759,388	697,806
Cash and cash equivalents at the end of the period	$ 494,352	$ 673,701	$ 759,388