Equity - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2022	Jul. 31, 2022	May 31, 2022	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022	Nov. 30, 2022	Nov. 30, 2021	May 31, 2021
Stockholder's Equity [Line Items]
Equity increase (decrease)						$ 461,000
Equity			$ 2,141,969	$ 2,603,426	$ 1,652,595	2,603,426	$ 1,652,595	$ 2,433,712	$ 1,390,985	$ 1,399,879
Patronage capital retirement				0	0	61,596	59,979
Net income				163,217	261,965	514,855	307,362
Cash Flow Hedging
Stockholder's Equity [Line Items]
Expected reclassification from AOCI over 12 months						1,000
Retained earnings allocation to patronage capital retirement
Stockholder's Equity [Line Items]
Equity			954,988	896,096	866,405	896,096	866,405	896,096	866,405	923,970
Patronage capital retirement						58,892	57,565
Retained earnings allocation to cooperative education fund
Stockholder's Equity [Line Items]
Equity			3,387	2,749	2,431	2,749	2,431	2,859	2,665	3,125
Retained earnings allocation to members' capital reserve
Stockholder's Equity [Line Items]
Equity			1,062,286	$ 1,062,286	$ 909,749	$ 1,062,286	$ 909,749	$ 1,062,286	$ 909,749	$ 909,749
Parent Company | Retained earnings allocation to patronage capital retirement
Stockholder's Equity [Line Items]
Net income		$ 89,000
Parent Company | Retained earnings allocation to cooperative education fund
Stockholder's Equity [Line Items]
Net income			$ 1,000
Parent Company | Retained earnings allocation to members' capital reserve
Stockholder's Equity [Line Items]
Net income		153,000
Parent Company | Retained earnings allocation of 50% of prior year patronage capital allocation
Stockholder's Equity [Line Items]
Net income		$ 44,000
Percentage of patronage capital allocation		50.00%
Parent Company | Retained earnings allocation held for twenty five years
Stockholder's Equity [Line Items]
Net income		$ 15,000
Period for which prior years allocated patronage capital is required to be held		25 years
Parent Company | Retained earnings, appropriated patronage capital allocated and retired
Stockholder's Equity [Line Items]
Net income		$ 59,000
Patronage refunds	$ 59,000