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, 2021	$ 1,743,025	$ 1,295	$ 1,055,400	$ (653,006)	$ (514,884)	$ 1,852,259	$ 1,741,064	$ 1,961
Beginning Balance (in shares) at May. 31, 2021		129,573,000
Net income	134,795					134,582	134,582	213
Other comprehensive income (loss)	(25,654)				(25,624)		(25,624)	(30)
Dividends declared and paid	(48,901)					(48,901)	(48,901)
Share repurchases under repurchase program	(12,500)	$ (1)	1	(12,500)			(12,500)
Share repurchases under repurchase program (in shares)		(133,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	(45)	$ 3	5,760	(5,808)			(45)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		303,000
Ending Balance at Aug. 31, 2021	1,790,720	$ 1,297	1,061,161	(671,314)	(540,508)	1,937,940	1,788,576	2,144
Ending Balance (in shares) at Aug. 31, 2021		129,743,000
Beginning 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
Beginning Balance (in shares) at May. 31, 2021		129,573,000
Net income	293,160
Other comprehensive income (loss)	(37,475)
Share repurchases under repurchase program	$ (27,500)
Share repurchases under repurchase program (in shares)	(305,321)
Ending Balance at Feb. 28, 2022	$ 1,836,645	$ 1,295	1,085,317	(691,418)	(552,308)	1,992,160	1,835,046	1,599
Ending Balance (in shares) at Feb. 28, 2022		129,496,000
Beginning Balance at Aug. 31, 2021	1,790,720	$ 1,297	1,061,161	(671,314)	(540,508)	1,937,940	1,788,576	2,144
Beginning Balance (in shares) at Aug. 31, 2021		129,743,000
Net income	125,116					124,875	124,875	241
Other comprehensive income (loss)	(33,266)				(33,237)		(33,237)	(29)
Dividends declared and paid	(52,535)					(51,824)	(51,824)	(711)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	7,721		11,878	(4,157)			7,721
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(66,000)
Ending Balance at Nov. 30, 2021	1,837,756	$ 1,297	1,073,039	(675,471)	(573,745)	2,010,991	1,836,111	1,645
Ending Balance (in shares) at Nov. 30, 2021		129,677,000
Net income	33,249					33,019	33,019	230
Other comprehensive income (loss)	21,445				21,437		21,437	8
Dividends declared and paid	(52,134)					(51,850)	(51,850)	(284)
Share repurchases under repurchase program	$ (15,000)	$ (2)	2	(15,000)			(15,000)
Share repurchases under repurchase program (in shares)	(171,933)	(172,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 11,329		12,276	(947)			11,329
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(9,000)
Ending Balance at Feb. 28, 2022	1,836,645	$ 1,295	1,085,317	(691,418)	(552,308)	1,992,160	1,835,046	1,599
Ending Balance (in shares) at Feb. 28, 2022		129,496,000
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	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	328,060
Other comprehensive income (loss)	(67,524)
Share repurchases under repurchase program	$ (37,500)
Share repurchases under repurchase program (in shares)	(446,175)
Ending Balance at Feb. 28, 2023	$ 2,054,982	$ 1,289	1,119,786	(769,933)	(604,821)	2,306,836	2,053,157	1,825
Ending Balance (in shares) at Feb. 28, 2023		128,933,000
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)
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
Net income	27,239					26,974	26,974	265
Other comprehensive income (loss)	(3,777)				(3,775)		(3,775)	(2)
Dividends declared and paid	(54,201)					(54,201)	(54,201)
Other noncontrolling interest activity	(62)							(62)
Share repurchases under repurchase program	$ (12,500)	$ (2)	2	(12,500)			(12,500)
Share repurchases under repurchase program (in shares)	(143,096)	(143,000)
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes	$ 6,198		6,759	(561)			6,198
Stock compensation expense and other deferred compensation, shares granted less shares returned for taxes (in shares)		(14,000)
Ending Balance at Feb. 28, 2023	$ 2,054,982	$ 1,289	$ 1,119,786	$ (769,933)	$ (604,821)	$ 2,306,836	$ 2,053,157	$ 1,825
Ending Balance (in shares) at Feb. 28, 2023		128,933,000