Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 589,442	$ 479,731	$ 492,466
Other comprehensive income (loss)
Foreign currency translation adjustments, net of tax	3,547	(69,918)	(95,214)
Pension and other postretirement benefit liability adjustments, net of tax	64,117	4,619	37,227
Unrealized (loss) on securities and other, net of tax	0	(549)	(1,725)
Unrealized (loss) gain on derivatives, net of tax	0	(1,766)	37,153
Total other comprehensive income (loss)	67,664	(67,614)	(22,559)
Total Comprehensive Income	657,106	412,117	469,907
Less: Comprehensive Income Attributable to Noncontrolling Interests	1,064	1,024	879
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 656,042	$ 411,093	$ 469,028