Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Aug. 31, 2021	Aug. 31, 2020
Income Statement [Abstract]
Net Sales		$ 1,650,420	$ 1,606,670
Cost of Sales		1,037,069	953,015
Gross Profit		613,351	653,655
Selling, General and Administrative Expenses		418,850	395,953
Restructuring Expense		1,010	4,233
Interest Expense		21,109	21,745
Investment (Income), Net		(5,750)	(12,763)
Other (Income) Expense, Net		(3,339)	3,118
Income Before Income Taxes		181,471	241,369
Provision for Income Taxes		46,676	60,584
Net Income		134,795	180,785
Less: Net Income Attributable to Noncontrolling Interests		213	190
Net Income Attributable to RPM International Inc. Stockholders		$ 134,582	$ 180,595
Average Number of Shares of Common Stock Outstanding:
Basic		128,083	128,418
Diluted	[1]	128,570	128,783
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 1.04	$ 1.39
Diluted		$ 1.04	$ 1.39

[1] Restricted shares totaling 157,700 and 225,500 for the three months ended August 31, 2021 and 2020, 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 680,000 and 360,000 for the three months ended August 31, 2021 and 2020, respectively, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.