Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total RPM International Inc. Equity	Noncontrolling Interests
Beginning Balance at May. 31, 2020	$ 1,264,663	$ 1,295	$ 1,014,428	$ (580,117)	$ (717,497)	$ 1,544,336	$ 1,262,445	$ 2,218
Beginning Balance (in shares) at May. 31, 2020		129,511,000
Net income	503,500					502,643	502,643	857
Other comprehensive income (loss)	202,745				202,613		202,613	132
Dividends declared and paid	(194,720)					(194,720)	(194,720)
Other noncontrolling interest activity	(1,246)							(1,246)
Share repurchases under repurchase program	$ (49,956)	$ (6)	6	(49,956)			(49,956)
Share repurchases under repurchase program (in shares)	(594,061)	(594,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 18,039	$ 6	40,966	(22,933)			18,039
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		656,000
Ending Balance at May. 31, 2021	1,743,025	$ 1,295	1,055,400	(653,006)	(514,884)	1,852,259	1,741,064	1,961
Ending Balance (in shares) at May. 31, 2021		129,573,000
Net income	492,466					491,481	491,481	985
Other comprehensive income (loss)	(22,559)				(22,453)		(22,453)	(106)
Dividends declared and paid	(204,394)					(204,394)	(204,394)
Other noncontrolling interest activity	(1,441)							(1,441)
Share repurchases under repurchase program	$ (52,500)	$ (6)	6	(52,500)			(52,500)
Share repurchases under repurchase program (in shares)	(601,155)	(601,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 29,231	$ 3	40,741	(11,513)			29,231
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		227,000
Ending 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
Ending Balance (in shares) at May. 31, 2022		129,199,000
Net income	479,731					478,691	478,691	1,040
Other comprehensive income (loss)	(67,614)				(67,598)		(67,598)	(16)
Dividends declared and paid	(213,912)					(213,912)	(213,912)
Other noncontrolling interest activity	(263)							(263)
Share repurchases under repurchase program	$ (50,000)	$ (6)	6	(50,000)			(50,000)
Share repurchases under repurchase program (in shares)	(598,653)	(598,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 11,230	$ 2	28,672	(17,444)			11,230
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		165,000
Ending 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
Ending Balance (in shares) at May. 31, 2023		128,766,000