Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 131,542	$ 125,116	$ 300,821	$ 259,911
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $570; $1,521; $2,191 and $3,858, respectively)	9,172	(46,866)	(69,783)	(85,846)
Pension and other postretirement benefit liability adjustments (net of tax of $1,074; $1,213; $2,505 and $2,679, respectively)	3,549	3,587	7,821	8,029
Unrealized (loss) gain on securities and other (net of tax of $117; $90; $206 and $235, respectively)	(234)	(177)	(574)	97
Unrealized (loss) gain on derivatives (net of tax of zero; $3,142; zero and $5,713, respectively)	(604)	10,190	(1,211)	18,800
Total other comprehensive income (loss)	11,883	(33,266)	(63,747)	(58,920)
Total Comprehensive Income	143,425	91,850	237,074	200,991
Less: Comprehensive Income Attributable to Noncontrolling Interests	222	212	426	395
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 143,203	$ 91,638	$ 236,648	$ 200,596