Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Income Statement [Abstract]
Net Sales		$ 1,909,895	$ 1,845,318	$ 4,023,638	$ 3,814,107
Cost of Sales		1,129,728	1,080,774	2,350,255	2,212,890
Gross Profit		780,167	764,544	1,673,383	1,601,217
Selling, General and Administrative Expenses		549,465	529,836	1,122,999	1,055,982
Restructuring Expense		4,531	7,557	13,345	14,759
Interest Expense		28,005	23,177	57,331	47,611
Investment (Income), Net		(10,026)	(8,526)	(23,430)	(19,552)
Other (Income), Net		(2,803)	(482)	(5,904)	(1,016)
Income Before Income Taxes		210,995	212,982	509,042	503,433
Provision for Income Taxes		49,521	29,532	119,728	91,429
Net Income		161,474	183,450	389,314	412,004
Less: Net Income Attributable to Noncontrolling Interests		267	246	502	1,108
Net Income Attributable to RPM International Inc. Stockholders		$ 161,207	$ 183,204	$ 388,812	$ 410,896
Average Number of Shares of Common Stock Outstanding:
Basic		127,129	127,658	127,206	127,675
Diluted	[1]	127,649	128,344	127,799	128,392
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 1.26	$ 1.43	$ 3.04	$ 3.21
Diluted		$ 1.26	$ 1.42	$ 3.03	$ 3.19

[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 six months ended November 30, 2025, approximately 580,000 and 480,000 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 six months ended November 30, 2024, approximately 300,000 and 230,000 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.