Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 169,279	$ 134,795
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $1,621 and $2,337, respectively)	(78,956)	(38,980)
Pension and other postretirement benefit liability adjustments (net of tax of $1,431 and $1,466, respectively)	4,272	4,442
Unrealized (loss) gain on securities and other (net of tax of $89 and $145, respectively)	(340)	274
Unrealized (loss) gain on derivatives (net of tax of zero and $2,571, respectively)	(606)	8,610
Total other comprehensive (loss)	(75,630)	(25,654)
Total Comprehensive Income	93,649	109,141
Less: Comprehensive Income Attributable to Noncontrolling Interests	204	183
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 93,445	$ 108,958