Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Income Statement [Abstract]
Interest income		$ 287,037	$ 281,253	$ 577,052	$ 559,744
Interest expense	[1],[2]	(207,871)	(204,166)	(421,142)	(414,397)
Net interest income		79,166	77,087	155,910	145,347
Benefit for loan losses		1,045	1,788	1,015	1,897
Net interest income after benefit for loan losses		80,211	78,875	156,925	147,244
Non-interest income:
Fee and other income		3,842	3,595	14,783	7,506
Derivative gains (losses)		183,450	63,343	(212,275)	70,526
Unrealized gains (losses) on equity securities		(114)	(1,619)	1,506	(2,345)
Total non-interest income		187,178	65,319	(195,986)	75,687
Non-interest expense:
Salaries and employee benefits		(12,728)	(12,392)	(25,670)	(25,074)
Other general and administrative expenses		(12,041)	(11,478)	(24,428)	(22,001)
Losses on early extinguishment of debt		(614)	0	(614)	(7,100)
Other non-interest (expense) income		(315)	(355)	6,864	(749)
Total non-interest expense		(25,698)	(24,225)	(43,848)	(54,924)
Income (loss) before income taxes		241,691	119,969	(82,909)	168,007
Income tax benefit (expense)		(91)	(243)	430	(303)
Net income (loss)		241,600	119,726	(82,479)	167,704
Less: Net (income) loss attributable to noncontrolling interests		(8)	(466)	1,649	(479)
Net income (loss) attributable to CFC		$ 241,592	$ 119,260	$ (80,830)	$ 167,225

[1] Includes amortization of debt discounts and debt issuance costs, which are generally deferred and recognized as interest expense using the effective interest method. Issuance costs related to dealer commercial paper, however, are recognized as interest expense immediately as incurred.

[2] Includes fees related to funding arrangements, such as up-front fees paid to banks participating in our committed bank revolving line of credit agreements. Depending on the nature of the fee, amounts may be deferred and recognized as interest expense ratably over the term of the arrangement or recognized immediately as incurred.