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)		(152,000)
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, 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	464,318
Other comprehensive income (loss)	(61,003)
Share repurchases under repurchase program	$ (52,500)
Share repurchases under repurchase program (in shares)	(423,879)
Ending Balance at Feb. 28, 2025	$ 2,675,782	$ 1,284	1,172,247	(934,470)	(598,290)	3,033,505	2,674,276	1,506
Ending Balance (in shares) at Feb. 28, 2025		128,423,000
Beginning 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
Beginning Balance (in shares) at Aug. 31, 2024		128,702,000
Net income	183,450					183,204	183,204	246
Other comprehensive income (loss)	(40,188)				(40,173)		(40,173)	(15)
Dividends declared and paid	(65,622)					(65,622)	(65,622)
Other noncontrolling interest activity	(708)							(708)
Share repurchases under repurchase program and related excise tax	(17,478)	$ (1)	1	(17,478)			(17,478)
Share repurchases under repurchase program and related excise tax (in Shares)		(129,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	6,669		7,323	(654)			6,669
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(5,000)
Ending Balance at Nov. 30, 2024	2,717,650	$ 1,286	1,164,301	(915,818)	(580,763)	3,047,021	2,716,027	1,623
Ending Balance (in shares) at Nov. 30, 2024		128,568,000
Net income	52,314					52,034	52,034	280
Other comprehensive income (loss)	(17,534)				(17,527)		(17,527)	(7)
Dividends declared and paid	(65,550)					(65,550)	(65,550)
Other noncontrolling interest activity	(390)							(390)
Share repurchases under repurchase program	$ (17,500)	$ (2)	2	(17,500)			(17,500)
Share repurchases under repurchase program (in shares)	(142,864)	(143,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 6,792		7,944	(1,152)			6,792
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(2,000)
Ending Balance at Feb. 28, 2025	2,675,782	$ 1,284	1,172,247	(934,470)	(598,290)	3,033,505	2,674,276	1,506
Ending Balance (in shares) at Feb. 28, 2025		128,423,000
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)		(146,000)
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
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	440,928
Other comprehensive income (loss)	54,828
Share repurchases under repurchase program	$ (52,500)
Share repurchases under repurchase program (in shares)	(453,610)
Ending Balance at Feb. 28, 2026	$ 3,148,120	$ 1,279	1,202,259	(1,009,239)	(478,803)	3,431,151	3,146,647	1,473
Ending Balance (in shares) at Feb. 28, 2026		127,873,000
Beginning 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
Beginning Balance (in shares) at Aug. 31, 2025		128,219,000
Net income	161,474					161,207	161,207	267
Other comprehensive income (loss)	(9,091)				(9,083)		(9,083)	(8)
Dividends declared and paid	(69,198)					(69,198)	(69,198)
Other noncontrolling interest activity	(261)							(261)
Share repurchases under repurchase program	(17,500)	$ (1)	1	(17,500)			(17,500)
Share repurchases under repurchase program (in shares)		(155,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	8,795		9,099	(304)			8,795
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		12,000
Ending Balance at Nov. 30, 2025	3,130,813	$ 1,281	1,192,372	(991,176)	(521,915)	3,448,857	3,129,419	1,394
Ending Balance (in shares) at Nov. 30, 2025		128,076,000
Net income	51,614					51,364	51,364	250
Other comprehensive income (loss)	43,119				43,112		43,112	7
Dividends declared and paid	(69,070)					(69,070)	(69,070)
Other noncontrolling interest activity	(178)							(178)
Share repurchases under repurchase program	$ (17,500)	$ (2)	2	(17,500)			(17,500)
Share repurchases under repurchase program (in shares)	(152,426)	(152,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 9,322		9,885	(563)			9,322
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(51,000)
Ending Balance at Feb. 28, 2026	$ 3,148,120	$ 1,279	$ 1,202,259	$ (1,009,239)	$ (478,803)	$ 3,431,151	$ 3,146,647	$ 1,473
Ending Balance (in shares) at Feb. 28, 2026		127,873,000