CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 211,799	$ 162,814
Adjustments to reconcile net income to net cash provided by operating activities
Amortization of deferred income	(7,156)	(6,879)
Amortization of debt issuance costs and deferred charges	5,393	5,733
Amortization of discount on long-term debt	4,046	2,953
Amortization of issuance costs on revolving bank lines of credit	2,098	2,159
Depreciation	4,254	3,984
Provision for loan losses	3,161	4,927
Provision for (recovery of) guarantee liability	159	(147)
Results of operations of foreclosed assets	8,482	(804)
Derivative forward value	(98,925)	(62,194)
Net changes in operating assets and liabilities:
Accrued interest and other receivables	(37,792)	27,948
Accounts payable	67,489	17,635
Accrued interest payable	58,140	50,688
Deferred income	61,109	666
Other	(1,116)	(5,183)
Net cash provided by operating activities	281,141	204,300
CASH FLOWS FROM INVESTING ACTIVITIES
Advances made on loans	(6,165,888)	(6,021,056)
Principal collected on loans	5,825,426	5,455,065
Net investment in fixed assets	(6,004)	(4,648)
Proceeds from foreclosed assets	0	46,284
Investments in foreclosed assets	(2,160)	(79,372)
Investments in time deposits	0	(450,000)
Proceeds from early redemption of investments	0	57,578
Investments in equity securities	0	(30,000)
Change in restricted cash	440	475
Net cash used in investing activities	(348,186)	(1,025,674)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuances of short-term debt, net	762,205	686,383
Proceeds from issuances of short term debt with original maturity greater than 90 days	593,401	370,949
Repayments of short term debt with original maturity greater than 90 days	(620,404)	(394,366)
Proceeds from issuance of long-term debt	(2,368,220)	(1,062,956)
Payments for redemption of long-term debt	56,386	57,166
Proceeds from issuance of members' subordinated certificates	(99,507)	(15,358)
Payments for retirement of members' subordinated certificates	(40,030)	(34,872)
Cash paid portion of debt exchange premium	0	(133,406)
Net cash provided by financing activities	732,898	1,419,434
NET INCREASE IN CASH AND CASH EQUIVALENTS	665,853	598,060
BEGINNING CASH AND CASH EQUIVALENTS	177,062	191,167
ENDING CASH AND CASH EQUIVALENTS	842,915	789,227
Cash paid for:
Interest	426,755	461,263
Income taxes	157	97
Non-cash financing and investing activities:
Net decrease in debt service reserve funds/debt service reserve certificates	(450)	0
Collateral trust bonds issued as debt exchange premium	0	39,647
Revolving bank lines of credit
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance costs for revolving bank lines of credit	0	(50)
Subordinated deferrable debt
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance costs for revolving bank lines of credit	$ 2,449,067	$ 1,945,944