Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Cash flow from operating activities:
Net earnings	$ 370,857	$ 790,583	$ 398,424
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	581,025	555,069	481,520
Amortization of deferred policy acquisition costs	28,556	24,514	26,218
Amortization of premiums and accretion of discounts related to investments, net	13,107	12,790	11,828
Amortization of debt issuance costs	3,923	3,868	4,062
Interest credited to policyholders	35,387	32,302	25,020
Change in allowance for losses on trade receivables	52	(120)	(46)
Change in allowance for inventory reserves	(146)	5,065	1,330
Net gains on disposal of personal property	(26,982)	(11,822)	(32,495)
Net gains on disposal of real estate	(44)	(195,414)	(3,590)
Net gains on sales of investments	(2,663)	(6,269)	(5,284)
Net losses on equity investments	5,739
Deferred income taxes	106,811	(193,434)	173,112
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(31,365)	(15,329)	(2,890)
Inventories and parts	(13,492)	(12,384)	(4,072)
Prepaid expenses	(8,620)	(40,765)	9,386
Capitalization of deferred policy acquisition costs	(25,957)	(27,350)	(27,111)
Other assets	157,152	(165,968)	(2,488)
Related party assets	4,194	53,408	343
Accounts payable and accrued expenses	10,263	(36,980)	(15,548)
Policy benefits and losses, claims and loss expenses payable	(236,120)	161,121	15,378
Other policyholders' funds and liabilities	5,007	(109)	1,499
Deferred income	966	5,524	5,921
Related party liabilities	(2,067)	(616)	(1,062)
Net cash provided by operating activities	975,583	937,684	1,059,455
Cash flow from investing activities:
Escrow deposits	4,299	31,362	(38,058)
Purchase of:
Property, plant and equipment	(1,869,968)	(1,363,745)	(1,419,505)
Short term investments	(54,048)	(63,556)	(635,847)
Fixed maturities investments	(540,045)	(390,900)	(355,101)
Equity securities	(957)	(662)	(489)
Preferred stock		(1,000)
Real estate	(635)	(1,939)	(32,807)
Mortgage loans	(63,611)	(83,507)	(154,310)
Proceeds from sale and paydowns of:
Property, plant and equipment	606,271	699,803	487,475
Short term investments	66,037	67,790	655,726
Fixed maturities investments	123,551	163,469	189,242
Equity securities	8,608
Preferred stock	1,625	4,208	4,181
Real estate		2,783	8,753
Mortgage loans	147,737	37,590	106,832
Net cash used by investing activities	(1,571,136)	(898,304)	(1,183,908)
Cash flow from financing activities:
Borrowings from credit facilities	897,311	498,464	742,625
Principal repayments on credit facilities	(299,748)	(356,451)	(367,844)
Debt issuance costs	(7,243)	(5,111)	(5,055)
Capital lease payments	(303,431)	(296,363)	(212,545)
Employee stock ownership plan	(418)	(11,640)	(11,106)
Securitization deposits		(2,180)	446
Common stock dividends paid	(39,179)	(29,380)	(58,757)
Investment contract deposits	400,123	401,814	285,148
Investment contract withdrawals	(132,833)	(182,549)	(149,159)
Net cash provided by financing activities	514,582	16,604	223,753
Effects of exchange rate on cash	(4,716)	5,598	(2,140)
Increase (decrease) in cash and cash equivalents	(85,687)	61,582	97,160
Cash and cash equivalents at the beginning of period	759,388	697,806	600,646
Cash and cash equivalents at the end of the period	$ 673,701	$ 759,388	$ 697,806