Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 227,840	$ 228,554
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	19,483	(3,772)
Pension and other postretirement benefit liability adjustments, net of tax	1,093	(142)
Unrealized gain on securities, net of tax	224	633
Total other comprehensive income (loss)	20,800	(3,281)
Total Comprehensive Income	248,640	225,273
Less: Comprehensive Income Attributable to Noncontrolling Interests	236	881
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 248,404	$ 224,392