Equity - Accumulated Other Comprehensive Income Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
AOCI, Net of Tax
Beginning balance	$ 2,141,969	$ 1,399,879
Changes in unrealized gains	0	416
Realized (gains) losses reclassified to earnings	(89)	(26)
Ending balance	2,246,935	1,254,220
Total
AOCI, Net of Tax
Beginning balance	2,258	(25)
Ending balance	2,169	365
Unrealized Gains on Derivative Hedges
AOCI, Net of Tax
Beginning balance	5,123	1,718
Changes in unrealized gains	0	416
Realized (gains) losses reclassified to earnings	(189)	(97)
Ending balance	4,934	2,037
Unrealized Losses on Defined Benefit Plans
AOCI, Net of Tax
Beginning balance	(2,865)	(1,743)
Changes in unrealized gains	0	0
Realized (gains) losses reclassified to earnings	100	71
Ending balance	$ (2,765)	$ (1,672)