Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Income Statement [Abstract]
Net Sales		$ 1,433,879	$ 1,269,395	$ 4,723,838	$ 4,361,981
Cost of Sales		935,293	797,454	3,029,287	2,650,213
Gross Profit		498,586	471,941	1,694,551	1,711,768
Selling, General and Administrative Expenses		433,569	402,186	1,290,245	1,197,556
Restructuring Expense		1,140	3,129	5,128	12,280
Interest Expense		22,016	20,964	64,127	63,975
Investment (Income) Expense, Net		4,355	(11,454)	1,421	(33,735)
(Gain) on Sales of Assets, Net		(249)		(42,491)	0
Other (Income) Expense, Net		(2,742)	1,256	(9,001)	7,507
Income Before Income Taxes		40,497	55,860	385,122	464,185
Provision for Income Taxes		7,248	17,394	91,962	117,049
Net Income		33,249	38,466	293,160	347,136
Less: Net Income Attributable to Noncontrolling Interests		230	224	684	640
Net Income Attributable to RPM International Inc. Stockholders		$ 33,019	$ 38,242	$ 292,476	$ 346,496
Average Number of Shares of Common Stock Outstanding:
Basic		127,943	128,447	128,013	128,455
Diluted	[1]	129,702	129,949	129,622	129,052
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.26	$ 0.30	$ 2.27	$ 2.68
Diluted		$ 0.25	$ 0.29	$ 2.26	$ 2.66

[1] For the three and nine months ended February 28, 2022, no restricted shares were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive. For the three and nine months ended February 28, 2021, restricted shares totaling 225,500 and 231,450 were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive. In addition, stock appreciation rights (“SARs”) totaling 320,000 and 655,000 for the three and nine months ended February 28, 2022, and 360,000 for both the three and nine months ended February 28, 2021, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.