Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 161,474	$ 183,450	$ 389,314	$ 412,004
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net of tax	(10,681)	(42,341)	8,802	(46,113)
Pension and other postretirement benefit liability adjustments, net of tax	1,415	2,200	2,508	2,058
Unrealized gain (loss) on securities, net of tax	175	(47)	399	586
Total other comprehensive (loss) income	(9,091)	(40,188)	11,709	(43,469)
Total Comprehensive Income	152,383	143,262	401,023	368,535
Less: Comprehensive Income Attributable to Noncontrolling Interests	259	231	495	1,112
Comprehensive Income Attributable to RPM International Inc. Stockholders	$ 152,124	$ 143,031	$ 400,528	$ 367,423