Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020
Cash flows from operating activities:
Net income	$ 45,397	$ 305,108
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan fees	(4,232)	(4,804)
Amortization of debt issuance costs and deferred charges	4,895	6,191
Amortization of discount on long-term debt	6,402	5,838
Amortization of issuance costs for bank revolving lines of credit	2,262	2,223
Depreciation and amortization	3,974	3,637
Provision (benefit) for credit losses	603	1,964
Loss on early extinguishment of debt	118	1,455
Unrealized (gains) losses on equity and debt securities	6,512	(2,985)
Derivative forward value (gains) losses	72,562	(198,335)
Changes in operating assets and liabilities:
Accrued interest receivable	(525)	11,993
Accrued interest payable	(3,233)	(15,853)
Deferred income	180	980
Other	4,171	(7,600)
Net cash provided by operating activities	139,086	109,812
Cash flows from investing activities:
Advances on loans, net	(519,707)	(360,309)
Investments in fixed assets, net	(8,722)	(2,682)
Purchase of trading securities	(86,334)	(306,215)
Proceeds from sales and maturities of trading securities	64,922	65,562
Proceeds from redemption of equity securities	0	30,000
Net cash used in investing activities	(549,841)	(573,644)
Cash flows from financing activities:
Proceeds from short-term borrowings ≤ 90 days, net	321,906	870,478
Proceeds from short-term borrowings with original maturity 90 days	1,258,908	1,532,452
Repayments of short-term borrowings with original maturity 90 days	(1,415,975)	(1,676,947)
Payments for issuance costs for revolving bank lines of credit	(3,563)	0
Proceeds from issuance of long-term debt, net of discount and issuance costs	1,459,259	422,683
Payments for retirement of long-term debt	(1,269,200)	(1,075,719)
Payments made for early extinguishment of debt	(118)	(1,455)
Proceeds from issuance of members’ subordinated certificates	177	13,448
Payments for retirement of members’ subordinated certificates	(2,488)	(66,101)
Payments for retirement of patronage capital	(57,760)	(57,835)
Net cash provided by (used in) financing activities	291,146	(38,996)
Net decrease in cash, cash equivalents and restricted cash	(119,609)	(502,828)
Beginning cash, cash equivalents and restricted cash	303,361	680,019
Ending cash, cash equivalents and restricted cash	183,752	177,191
Supplemental disclosure of cash flow information:
Cash paid for interest	335,793	353,057
Cash paid for income taxes	$ 12	$ 69