Equity - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended
	Sep. 30, 2023	Jul. 31, 2023	May 31, 2023	Aug. 31, 2023	Aug. 31, 2022	May 31, 2022
Stockholder's Equity [Line Items]
Equity increase (decrease)				$ 159,000
Equity			$ 2,589,249	2,747,927	$ 2,246,935	$ 2,141,969
Net income				228,284	161,874
Patronage capital retirement				71,980	58,892
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			1,006,115	934,135	896,096	954,988
Patronage capital retirement		$ 72,000		71,980	58,892
Retained earnings allocation to cooperative education fund
Stockholder's Equity [Line Items]
Equity			3,534	3,085	3,052	3,387
Retained earnings allocation to members' capital reserve
Stockholder's Equity [Line Items]
Equity			1,202,152	$ 1,202,152	$ 1,062,286	$ 1,062,286
Parent Company | Retained earnings allocation to patronage capital retirement
Stockholder's Equity [Line Items]
Net income		110,000
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		140,000
Parent Company | Retained earnings, appropriated patronage capital allocated and retired
Stockholder's Equity [Line Items]
Net income		72,000
Parent Company | Retained earnings, appropriated patronage capital allocated and retired | Subsequent Event
Stockholder's Equity [Line Items]
Patronage refunds	$ 72,000
Parent Company | Retained earnings allocation of 50% of prior year patronage capital allocation
Stockholder's Equity [Line Items]
Net income		$ 55,000
Percentage of patronage capital allocation		50.00%
Parent Company | Retained earnings allocation held for twenty five years
Stockholder's Equity [Line Items]
Net income		$ 17,000
Period for which prior years allocated patronage capital is required to be held		25 years