Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Aug. 31, 2022	Aug. 31, 2021
Income Statement [Abstract]
Net Sales		$ 1,932,320	$ 1,650,420
Cost of Sales		1,187,849	1,037,069
Gross Profit		744,471	613,351
Selling, General and Administrative Expenses		485,205	418,850
Restructuring Expense		1,354	1,010
Interest Expense		26,711	21,109
Investment Expense (Income), Net		3,664	(5,750)
Other Expense (Income), Net		2,416	(3,339)
Income Before Income Taxes		225,121	181,471
Provision for Income Taxes		55,842	46,676
Net Income		169,279	134,795
Less: Net Income Attributable to Noncontrolling Interests		266	213
Net Income Attributable to RPM International Inc. Stockholders		$ 169,013	$ 134,582
Average Number of Shares of Common Stock Outstanding:
Basic		127,617	128,083
Diluted	[1]	128,161	128,570
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 1.31	$ 1.04
Diluted		$ 1.31	$ 1.04

[1] For the three months ended August 31, 2022 and 2021, approximately 715,000 and 837,700 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.