Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Income Statement [Abstract]
Net Sales		$ 1,639,538	$ 1,485,915	$ 3,289,959	$ 3,092,586
Cost of Sales		1,056,924	899,743	2,093,994	1,852,759
Gross Profit		582,614	586,172	1,195,965	1,239,827
Selling, General and Administrative Expenses		437,709	399,418	856,676	795,370
Restructuring Expense		2,977	4,918	3,988	9,151
Interest Expense		21,002	21,266	42,111	43,011
Investment (Income) Expense, Net		2,816	(9,519)	(2,934)	(22,281)
(Gain) on Sales of Assets, Net		(42,124)		(42,242)	0
Other (Income) Expense, Net		(2,920)	3,133	(6,259)	6,251
Income Before Income Taxes		163,154	166,956	344,625	408,325
Provision for Income Taxes		38,038	39,072	84,714	99,655
Net Income		125,116	127,884	259,911	308,670
Less: Net Income Attributable to Noncontrolling Interests		241	225	454	416
Net Income Attributable to RPM International Inc. Stockholders		$ 124,875	$ 127,659	$ 259,457	$ 308,254
Average Number of Shares of Common Stock Outstanding:
Basic		128,022	128,500	128,058	128,459
Diluted	[1]	128,494	129,090	128,537	129,078
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.97	$ 0.98	$ 2.01	$ 2.38
Diluted		$ 0.96	$ 0.98	$ 2.00	$ 2.37

[1] For the three and six months ended November 30, 2021, no restricted shares were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive. For the three and six months ended November 30, 2020, restricted shares totaling 225,500 and 339,550 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 660,000 for both the three and six months ended November 30, 2021, and 360,000 for both the three and six months ended November 30, 2020, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.