Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 183,450	$ 145,815	$ 412,004	$ 347,128
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net of tax	(42,341)	(44)	(46,113)	8,809
Pension and other postretirement benefit liability adjustments, net of tax	2,200	3,446	2,058	6,610
Unrealized (loss) gain on securities, net of tax	(47)	94	586	(163)
Total other comprehensive (loss) income	(40,188)	3,496	(43,469)	15,256
Total Comprehensive Income	143,262	149,311	368,535	362,384
Less: Comprehensive Income Attributable to Noncontrolling Interests	231	307	1,112	552
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 143,031	$ 149,004	$ 367,423	$ 361,832