Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Income Statement [Abstract]
Net Sales		$ 1,607,949	$ 1,476,562	$ 5,631,587	$ 5,290,669
Cost of Sales		973,133	909,072	3,323,388	3,121,962
Gross Profit		634,816	567,490	2,308,199	2,168,707
Selling, General and Administrative Expenses		533,872	501,710	1,656,871	1,557,692
Restructuring Expense		19,855	3,456	33,200	18,215
Interest Expense		26,947	22,993	84,278	70,604
Investment (Income), Net		(12,179)	(1,266)	(35,609)	(20,818)
Other (Income), Net		(2,986)	(354)	(8,890)	(1,370)
Income Before Income Taxes		69,307	40,951	578,349	544,384
Provision (Benefit) for Income Taxes		17,693	(11,363)	137,421	80,066
Net Income		51,614	52,314	440,928	464,318
Less: Net Income Attributable to Noncontrolling Interests		250	280	752	1,388
Net Income Attributable to RPM International Inc. Stockholders		$ 51,364	$ 52,034	$ 440,176	$ 462,930
Average Number of Shares of Common Stock Outstanding:
Basic		127,045	127,536	127,156	127,628
Diluted	[1]	127,507	128,154	127,707	128,315
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.4	$ 0.41	$ 3.45	$ 3.61
Diluted		$ 0.4	$ 0.4	$ 3.43	$ 3.59

[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 and nine months ended February 28, 2026, approximately 460,000 and 420,000 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. For the three and nine months ended February 28, 2025, approximately 190,000 and 170,000 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.