Equity (Details Textual) (USD $)	9 Months Ended				1 Months Ended	9 Months Ended		1 Months Ended		12 Months Ended	1 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014 Patronage capital allocated	Feb. 28, 2013 Patronage capital allocated	Jul. 31, 2013 Patronage capital allocated Authorized Allocations	Feb. 28, 2014 Members' capital reserve	Feb. 28, 2013 Members' capital reserve	May 31, 2013 CFC Cooperative educational fund Authorized Allocations	Jul. 31, 2013 CFC Patronage capital allocated Authorized Allocations	May 31, 2013 CFC Patronage capital allocated Authorized Allocations	Jul. 31, 2013 CFC Members' capital reserve
Equity
Allocation of net earnings								$ 1,000,000		$ 81,000,000	$ 138,000,000
Retirement of net allocated earnings	$ 40,724,000	$ 35,646,000	$ 40,724,000	$ 36,075,000	$ 41,000,000	$ 0	$ 0
Retirement of allocated net earnings, percentage									50.00%