CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (151,210)	$ 457,364	$ 312,099
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred loan fees	(10,009)	(11,296)	(14,072)
Amortization of debt issuance costs and deferred charges	10,439	10,456	9,484
Amortization of discount on long-term debt	10,605	10,164	9,501
Amortization of issuance costs for bank revolving lines of credit	5,324	5,346	5,531
Depreciation and amortization	9,305	7,931	7,173
Provision (benefit) for loan losses	(1,266)	(18,575)	5,978
Results of operations of foreclosed assets	0	0	1,749
Loss on early extinguishment of debt	7,100	0	0
Unrealized losses on equity securities	1,799	0	0
Derivative forward value (gains) losses	319,730	(306,002)	(179,381)
Changes in operating assets and liabilities:
Accrued interest receivable	(6,163)	(15,949)	1,778
Accrued interest payable	9,713	11,808	4,480
Deferred income	2,077	3,246	9,393
Other	(10,401)	741	5,855
Net cash provided by operating activities	197,043	155,234	179,568
Cash flows from investing activities:
Advances on loans, net	(738,171)	(811,164)	(1,145,673)
Investment in fixed assets	(14,725)	(15,194)	(17,793)
Net cash proceeds from sale of foreclosed assets	0	0	51,042
Net proceeds from time deposits	100,000	125,000	114,000
Purchases of held-to-maturity investments	(80,123)	(510,598)	0
Proceeds from maturities of held-to-maturity investments	35,340	1,394	0
Net cash used in investing activities	(697,679)	(1,210,562)	(998,424)
Cash flows from financing activities:
Proceeds from (repayments of) short-term borrowings, net	(452,618)	126,211	409,871
Proceeds from short-term borrowings with original maturity greater than 90 days	1,652,005	1,331,910	1,003,185
Repayments of short term-debt with original maturity greater than 90 days	(1,387,571)	(1,005,111)	(1,009,004)
Payments for issuance costs for revolving bank lines of credit	(2,382)	(2,441)	(2,548)
Proceeds from issuance of long-term debt, net of discount and issuance costs	3,281,595	2,349,885	2,923,868
Payments for retirement of long-term debt	(2,806,639)	(1,611,002)	(2,460,730)
Payments made for early extinguishment of debt	(7,100)	0	0
Payments for issuance costs for subordinated deferrable debt	(6,535)	0	(68)
Proceeds from issuance of subordinated debt	250,000	0	0
Proceeds from issuance of members’ subordinated certificates	1,986	6,136	3,626
Payments for retirement of members’ subordinated certificates	(24,861)	(45,180)	(28,220)
Payments for retirement of patronage capital	(49,860)	(44,667)	(41,871)
Repayments for membership fees, net	(4)	(10)	0
Net cash provided by financing activities	448,016	1,105,731	798,109
Net increase (decrease) in cash, cash equivalents and restricted cash	(52,620)	50,403	(20,747)
Beginning cash, cash equivalents and restricted cash	238,824	188,421	209,168
Ending cash, cash equivalents and restricted cash	186,204	238,824	188,421
Supplemental disclosure of cash flow information:
Cash paid for interest	801,966	766,059	712,742
Cash paid for income taxes	112	321	407
Noncash financing and investing activities:
Loan provided in connection with the sale of foreclosed assets	$ 0	$ 0	$ 60,000