Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		May 31, 2021	May 31, 2020	May 31, 2019
Income Statement [Abstract]
Net Sales	[1]	$ 6,106,288	$ 5,506,994	$ 5,564,551
Cost of Sales		3,701,129	3,414,139	3,476,231
Gross Profit		2,405,159	2,092,855	2,088,320
Selling, General and Administrative Expenses		1,664,026	1,548,653	1,596,043
Restructuring Expense		18,106	33,108	42,310
Goodwill and Other Intangible Asset Impairments				4,190
Interest Expense		85,400	101,003	102,392
Investment (Income), Net		(44,450)	(9,739)	(730)
Other Expense, Net		13,639	12,066	4,270
Income Before Income Taxes		668,438	407,764	339,845
Provision for Income Taxes		164,938	102,682	72,158
Net Income		503,500	305,082	267,687
Less: Net Income Attributable to Noncontrolling Interests		857	697	1,129
Net Income Attributable to RPM International Inc. Stockholders		$ 502,643	$ 304,385	$ 266,558
Average Number of Shares of Common Stock Outstanding:
Basic		128,334	128,468	130,552
Diluted	[2]	128,927	129,974	134,333
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 3.89	$ 2.35	$ 2.03
Diluted		$ 3.87	$ 2.34	$ 2.01

[1] It is not practicable to obtain the information needed to disclose revenues attributable to each of our product lines.

[2] For the years ended May 31, 2021, 2020 and 2019, approximately 362,016, 340,000 and 862,500 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.