Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Aug. 31, 2025	Aug. 31, 2024
Income Statement [Abstract]
Net Sales		$ 2,113,743	$ 1,968,789
Cost of Sales		1,220,527	1,132,116
Gross Profit		893,216	836,673
Selling, General and Administrative Expenses		573,534	526,146
Restructuring Expense		8,814	7,202
Interest Expense		29,326	24,434
Investment (Income), Net		(13,404)	(11,026)
Other (Income), Net		(3,101)	(534)
Income Before Income Taxes		298,047	290,451
Provision for Income Taxes		70,207	61,897
Net Income		227,840	228,554
Less: Net Income Attributable to Noncontrolling Interests		235	862
Net Income Attributable to RPM International Inc. Stockholders		$ 227,605	$ 227,692
Average Number of Shares of Common Stock Outstanding:
Basic		127,283	127,691
Diluted	[1]	127,950	128,420
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 1.78	$ 1.78
Diluted		$ 1.77	$ 1.77

[1] The dilutive effect of performance-based restricted stock units is included when they have met minimum performance thresholds. The dilutive effect of SARs includes all outstanding awards except awards that are considered antidilutive. SARs are antidilutive when the exercise price exceeds the average market price of the Company’s common shares during the periods presented. For the three months ended August 31, 2025 and 2024, approximately 400,000 and 180,000 shares of stock, respectively, granted under stock-based compensation plans were excluded from the calculation of diluted EPS, as the effect would have been anti-dilutive.