Equity - Summary of activity in accumulated other comprehensive income account by component (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2026	May 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 3,103,466	$ 3,012,169
Ending balance	3,312,136	3,103,466
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,236)	(1,416)
Changes in unrealized gains (losses)	(139)	(47)
Realized (gains) losses reclassified to earnings	6	(773)
Ending balance	(2,369)	(2,236)
Unrealized Gains on Derivative Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	2,935	3,287
Changes in unrealized gains (losses)	0	803
Realized (gains) losses reclassified to earnings	(470)	(1,155)
Ending balance	2,465	2,935
Unrealized Losses on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,171)	(4,703)
Changes in unrealized gains (losses)	(139)	(850)
Realized (gains) losses reclassified to earnings	476	382
Ending balance	$ (4,834)	$ (5,171)