Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 61,478	$ 27,239	$ 408,606	$ 328,060
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	(7,591)	(6,935)	1,218	(76,719)
Pension and other postretirement benefit liability adjustments, net of tax	3,356	3,606	9,966	11,427
Unrealized gain (loss) on securities, net of tax	197	107	34	(467)
Unrealized (loss) on derivatives, net of tax	0	(555)	0	(1,765)
Total other comprehensive income (loss)	(4,038)	(3,777)	11,218	(67,524)
Total Comprehensive Income	57,440	23,462	419,824	260,536
Less: Comprehensive Income Attributable to Noncontrolling Interests	280	263	832	689
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 57,160	$ 23,199	$ 418,992	$ 259,847