v3.25.2

Pension Plans - Retirement-Related Benefit Plans' Impact on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Pension Benefits \| U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 10,863	$ 10,804
Interest cost	9,484	9,795
Expected return on plan assets	(13,326)	(12,017)
Prior service cost (credit)	1	1
Net actuarial losses (gains) recognized	1,448	2,153
Net Periodic Benefit Cost	8,470	10,736
Pension Benefits \| Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,467	1,120
Interest cost	2,028	1,963
Expected return on plan assets	(2,506)	(2,376)
Prior service cost (credit)	(25)	(32)
Net actuarial losses (gains) recognized	323	294
Net Periodic Benefit Cost	1,287	969
Postretirement Benefits \| U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	12	21
Net actuarial losses (gains) recognized	9	(6)
Net Periodic Benefit Cost	21	15
Postretirement Benefits \| Non-U.S. Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	234	425
Interest cost	272	318
Net actuarial losses (gains) recognized	(256)	(140)
Net Periodic Benefit Cost	$ 250	$ 603

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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RPM INTERNATIONAL INC/DE/ 10-Q