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, 2023	$ 2,143,000	$ 1,288	$ 1,124,825	$ (784,463)	$ (604,935)	$ 2,404,125	$ 2,140,840	$ 2,160
Beginning Balance (in shares) at May. 31, 2023		128,766,000
Net income	201,313					201,082	201,082	231
Other comprehensive (loss) income	11,760				11,746		11,746	14
Dividends declared and paid	(54,065)					(54,065)	(54,065)
Other noncontrolling interest activity	(712)							(712)
Share repurchases under repurchase program	(12,500)	$ (1)	1	(12,500)			(12,500)
Share repurchases under repurchase program (in shares)		(122,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	(5,960)	$ 3	9,115	(15,078)			(5,960)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		318,000
Ending Balance at Aug. 31, 2023	2,282,836	$ 1,290	1,133,941	(812,041)	(593,189)	2,551,142	2,281,143	1,693
Ending Balance (in shares) at Aug. 31, 2023		128,962,000
Beginning Balance at May. 31, 2023	2,143,000	$ 1,288	1,124,825	(784,463)	(604,935)	2,404,125	2,140,840	2,160
Beginning Balance (in shares) at May. 31, 2023		128,766,000
Net income	347,128
Other comprehensive (loss) income	15,256
Share repurchases under repurchase program	$ (25,000)
Share repurchases under repurchase program (in shares)	(254,283)
Ending Balance at Nov. 30, 2023	$ 2,362,554	$ 1,289	1,141,970	(830,402)	(589,690)	2,637,387	2,360,554	2,000
Ending Balance (in shares) at Nov. 30, 2023		128,872,000
Beginning Balance at Aug. 31, 2023	2,282,836	$ 1,290	1,133,941	(812,041)	(593,189)	2,551,142	2,281,143	1,693
Beginning Balance (in shares) at Aug. 31, 2023		128,962,000
Net income	145,815					145,505	145,505	310
Other comprehensive (loss) income	3,496				3,499		3,499	(3)
Dividends declared and paid	(59,260)					(59,260)	(59,260)
Share repurchases under repurchase program	$ (12,500)	$ (1)	1	(12,500)			(12,500)
Share repurchases under repurchase program (in shares)	(131,858)	(132,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 2,167		8,028	(5,861)			2,167
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		42,000
Ending Balance at Nov. 30, 2023	2,362,554	$ 1,289	1,141,970	(830,402)	(589,690)	2,637,387	2,360,554	2,000
Ending Balance (in shares) at Nov. 30, 2023		128,872,000
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	228,554					227,692	227,692	862
Other comprehensive (loss) income	(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	412,004
Other comprehensive (loss) income	(43,469)
Share repurchases under repurchase program	$ (35,000)
Share repurchases under repurchase program (in shares)	(281,015)
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
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 (loss) income	(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	$ (17,500)
Share repurchases under repurchase program (in shares)	(128,869)
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