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, 2022	$ 1,983,828	$ 1,292	$ 1,096,147	$ (717,019)	$ (537,337)	$ 2,139,346	$ 1,982,429	$ 1,399
Beginning Balance (in shares) at May. 31, 2022		129,199,000
Net income	169,279					169,013	169,013	266
Other comprehensive income (loss)	(75,630)				(75,568)		(75,568)	(62)
Dividends declared and paid	(51,420)					(51,420)	(51,420)
Other noncontrolling interest activity	(60)							(60)
Share repurchases under repurchase program	(25,000)	$ (3)	3	(25,000)			(25,000)
Share repurchases under repurchase program (in shares)		(303,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	(3,395)	$ 2	9,061	(12,458)			(3,395)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		203,000
Ending Balance at Aug. 31, 2022	1,997,602	$ 1,291	1,105,211	(754,477)	(612,905)	2,256,939	1,996,059	1,543
Ending Balance (in shares) at Aug. 31, 2022		129,099,000
Beginning Balance at May. 31, 2022	1,983,828	$ 1,292	1,096,147	(717,019)	(537,337)	2,139,346	1,982,429	1,399
Beginning Balance (in shares) at May. 31, 2022		129,199,000
Net income	300,821
Other comprehensive income (loss)	(63,747)
Share repurchases under repurchase program	$ (25,000)
Share repurchases under repurchase program (in shares)	(303,079)
Ending Balance at Nov. 30, 2022	$ 2,092,085	$ 1,291	1,113,025	(756,872)	(601,046)	2,334,063	2,090,461	1,624
Ending Balance (in shares) at Nov. 30, 2022		129,090,000
Beginning Balance at Aug. 31, 2022	1,997,602	$ 1,291	1,105,211	(754,477)	(612,905)	2,256,939	1,996,059	1,543
Beginning Balance (in shares) at Aug. 31, 2022		129,099,000
Net income	131,542					131,344	131,344	198
Other comprehensive income (loss)	11,883				11,859		11,859	24
Dividends declared and paid	(54,220)					(54,220)	(54,220)
Other noncontrolling interest activity	$ (141)							(141)
Share repurchases under repurchase program (in shares)	0
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 5,419		7,814	(2,395)			5,419
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(9,000)
Ending Balance at Nov. 30, 2022	2,092,085	$ 1,291	1,113,025	(756,872)	(601,046)	2,334,063	2,090,461	1,624
Ending Balance (in shares) at Nov. 30, 2022		129,090,000
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	201,313					201,082	201,082	231
Other comprehensive income (loss)	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 income (loss)	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 income (loss)	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