Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		May 31, 2020	May 31, 2019	May 31, 2018
Income Statement [Abstract]
Net Sales	[1]	$ 5,506,994	$ 5,564,551	$ 5,321,643
Cost of Sales		3,414,139	3,476,231	3,305,095
Gross Profit		2,092,855	2,088,320	2,016,548
Selling, General and Administrative Expenses		1,548,653	1,596,043	1,498,479
Restructuring Expense		33,108	42,310	17,514
Goodwill and Other Intangible Asset Impairments			4,190
Interest Expense		101,003	102,392	104,547
Investment (Income), Net		(9,739)	(730)	(20,442)
Other Expense (Income), Net		12,066	4,270	(598)
Income Before Income Taxes		407,764	339,845	417,048
Provision for Income Taxes		102,682	72,158	77,791
Net Income		305,082	267,687	339,257
Less: Net Income Attributable to Noncontrolling Interests		697	1,129	1,487
Net Income Attributable to RPM International Inc. Stockholders		$ 304,385	$ 266,558	$ 337,770
Average Number of Shares of Common Stock Outstanding:
Basic		128,468	130,552	131,179
Diluted	[2]	129,974	134,333	137,171
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 2.35	$ 2.03	$ 2.55
Diluted		$ 2.34	$ 2.01	$ 2.50

[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, 2020, 2019 and 2018, approximately 340,000, 862,500 and 799,362 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.