Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Total RPM International Inc. Equity	Noncontrolling Interests
Beginning Balance at May. 31, 2024	$ 2,512,225	$ 1,286	$ 1,150,751	$ (864,502)	$ (537,290)	$ 2,760,639	$ 2,510,884	$ 1,341
Beginning Balance (in shares) at May. 31, 2024		128,629,000
Net income	228,554					227,692	227,692	862
Other comprehensive income (loss)	(3,281)				(3,300)		(3,300)	19
Dividends declared and paid	(58,892)					(58,892)	(58,892)
Other noncontrolling interest activity	(122)							(122)
Share repurchases under repurchase program	$ (17,500)	$ (1)	1	(17,500)			(17,500)
Share repurchases under repurchase program (in shares)	(152,146)	(152,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ (9,457)	$ 2	6,225	(15,684)			(9,457)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		225,000
Ending Balance at Aug. 31, 2024	2,651,527	$ 1,287	1,156,977	(897,686)	(540,590)	2,929,439	2,649,427	2,100
Ending Balance (in shares) at Aug. 31, 2024		128,702,000
Beginning Balance at May. 31, 2025	2,886,782	$ 1,283	1,177,796	(953,856)	(533,631)	3,193,764	2,885,356	1,426
Beginning Balance (in shares) at May. 31, 2025		128,269,000
Net income	227,840					227,605	227,605	235
Other comprehensive income (loss)	20,800				20,799		20,799	1
Dividends declared and paid	(64,521)					(64,521)	(64,521)
Other noncontrolling interest activity	(266)							(266)
Share repurchases under repurchase program	$ (17,500)	$ (2)	2	(17,500)			(17,500)
Share repurchases under repurchase program (in shares)	(146,191)	(146,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 3,459	$ 1	5,474	(2,016)			3,459
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		96,000
Ending Balance at Aug. 31, 2025	$ 3,056,594	$ 1,282	$ 1,183,272	$ (973,372)	$ (512,832)	$ 3,356,848	$ 3,055,198	$ 1,396
Ending Balance (in shares) at Aug. 31, 2025		128,219,000