Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Aug. 31, 2022	Nov. 30, 2023	Nov. 30, 2022
Balance	$ 1,247.4	$ 1,154.6	$ 1,323.2	$ 1,266.3	$ 1,154.6	$ 1,266.3
Net earnings (loss)	(2.1)	62.1	(12.5)	31.3	60.0	18.8
Other comprehensive (loss) income	11.1	(8.2)	(3.5)	(13.3)	2.9	(16.8)
Transfers from Worthington Enterprises, Inc., net	(84.9)	40.8	(72.2)	38.9
Dividends to noncontrolling interests	0.0	(1.9)	(11.8)	0.0
Balance	1,171.5	1,247.4	1,223.2	1,323.2	1,171.5	1,223.2
Net Worthington Enterprises, Inc. Investment
Balance	1,130.4	1,031.1	1,200.3	1,131.3	1,031.1	1,131.3
Net earnings (loss)	(6.0)	58.5	(15.8)	30.1
Other comprehensive (loss) income	0.0	0.0	0.0	0.0
Transfers from Worthington Enterprises, Inc., net	(84.9)	40.8	(72.2)	38.9
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0
Balance	1,039.5	1,130.4	1,112.3	1,200.3	1,039.5	1,112.3
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(10.3)	(2.1)	(11.5)	1.8	(2.1)	1.8
Net earnings (loss)	0.0		0.0	0.0
Other comprehensive (loss) income	11.1	(8.2)	(3.5)	(13.3)
Transfers from Worthington Enterprises, Inc., net	0.0	0.0	0.0	0.0
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0
Balance	0.8	(10.3)	(15.0)	(11.5)	0.8	(15.0)
Parent
Balance	1,120.1	1,029.0	1,188.8	1,133.1	1,029.0	1,133.1
Net earnings (loss)	(6.0)	58.5	(15.8)	30.1
Other comprehensive (loss) income	11.1	(8.2)	(3.5)	(13.3)
Transfers from Worthington Enterprises, Inc., net	(84.9)	40.8	(72.2)	38.9
Dividends to noncontrolling interests	0.0	0.0	0.0	0.0
Balance	1,040.3	1,120.1	1,097.3	1,188.8	1,040.3	1,097.3
Noncontrolling Interest
Balance	127.3	125.6	134.4	133.2	125.6	133.2
Net earnings (loss)	3.9	3.6	3.3	1.2
Other comprehensive (loss) income	0.0	0.0	0.0	0.0
Transfers from Worthington Enterprises, Inc., net	0.0	0.0	0.0	0.0
Dividends to noncontrolling interests	0.0	(1.9)	(11.8)	0.0
Balance	$ 131.2	$ 127.3	$ 125.9	$ 134.4	$ 131.2	$ 125.9