Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 145,815	$ 131,542	$ 347,128	$ 300,821
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	(44)	9,172	8,809	(69,783)
Pension and other postretirement benefit liability adjustments, net of tax	3,446	3,549	6,610	7,821
Unrealized gain (loss) on securities, net of tax	94	(234)	(163)	(574)
Unrealized (loss) on derivatives, net of tax	0	(604)	0	(1,211)
Total other comprehensive income (loss)	3,496	11,883	15,256	(63,747)
Total Comprehensive Income	149,311	143,425	362,384	237,074
Less: Comprehensive Income Attributable to Noncontrolling Interests	307	222	552	426
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 149,004	$ 143,203	$ 361,832	$ 236,648