Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 51,614	$ 52,314	$ 440,928	$ 464,318
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	42,106	(19,666)	50,908	(65,779)
Pension and other postretirement benefit liability adjustments, net of tax	914	2,009	3,422	4,067
Unrealized gain on securities, net of tax	99	123	498	709
Total other comprehensive income (loss)	43,119	(17,534)	54,828	(61,003)
Total Comprehensive Income	94,733	34,780	495,756	403,315
Less: Comprehensive Income Attributable to Noncontrolling Interests	257	273	752	1,385
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 94,476	$ 34,507	$ 495,004	$ 401,930