Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Aug. 31, 2020	Aug. 31, 2019
Income Statement [Abstract]
Net Sales		$ 1,606,670	$ 1,472,764
Cost of Sales		953,015	898,010
Gross Profit		653,655	574,754
Selling, General and Administrative Expenses		395,953	400,566
Restructuring Charges		4,233	6,622
Interest Expense		21,745	28,317
Investment (Income), Net		(12,763)	(5,385)
Other Expense, Net		3,118	1,785
Income Before Income Taxes		241,369	142,849
Provision for Income Taxes		60,584	36,353
Net Income		180,785	106,496
Less: Net Income Attributable to Noncontrolling Interests		190	308
Net Income Attributable to RPM International Inc. Stockholders		$ 180,595	$ 106,188
Average Number of Shares of Common Stock Outstanding:
Basic		128,418	128,882
Diluted	[1]	128,783	129,504
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 1.39	$ 0.82
Diluted		$ 1.39	$ 0.82

[1] Restricted shares totaling 225,500 and 178,000 for the three months ended August 31, 2020 and 2019, respectively, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.   In addition, stock appreciation rights (“SARs”) totaling 360,000 and 790,000 for the three months ended August 31, 2020 and 2019, respectively, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.