Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 479,731	$ 492,466	$ 503,500
Other comprehensive (loss) income
Foreign currency translation adjustments, net of tax	(69,918)	(95,214)	140,499
Pension and other postretirement benefit liability adjustments, net of tax	4,619	37,227	87,107
Unrealized (loss) on securities and other, net of tax	(549)	(1,725)	(950)
Unrealized (loss) gain on derivatives, net of tax	(1,766)	37,153	(23,911)
Total other comprehensive (loss) income	(67,614)	(22,559)	202,745
Total Comprehensive Income	412,117	469,907	706,245
Less: Comprehensive Income Attributable to Noncontrolling Interests	1,024	879	988
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 411,093	$ 469,028	$ 705,257