Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Income Statement [Abstract]
Net Sales		$ 1,173,976	$ 1,140,630	$ 4,048,033	$ 3,963,150
Cost of Sales		739,229	731,208	2,509,133	2,510,643
Gross Profit		434,747	409,422	1,538,900	1,452,507
Selling, General and Administrative Expenses		381,866	374,153	1,185,791	1,175,049
Restructuring Charges		7,343	8,679	18,766	36,479
Interest Expense		23,972	26,525	78,630	74,058
Investment (Income) Expense, Net		3,836	(4,726)	(10,354)	(126)
Other Expense, Net		1,422	327	5,158	4,052
Income Before Income Taxes		16,308	4,464	260,909	162,995
Provision (Benefit) for Income Taxes		4,218	(10,032)	65,002	29,140
Net Income		12,090	14,496	195,907	133,855
Less: Net Income Attributable to Noncontrolling Interests		237	306	835	677
Net Income Attributable to RPM International Inc. Stockholders		$ 11,853	$ 14,190	$ 195,072	$ 133,178
Average Number of Shares of Common Stock Outstanding:
Basic		128,426	130,105	128,572	131,019
Diluted	[1]	130,028	131,889	129,238	132,829
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.09	$ 0.11	$ 1.51	$ 1.01
Diluted		$ 0.09	$ 0.11	$ 1.50	$ 1.00

[1] There were no shares of restricted stock identified as being anti-dilutive for the three or nine months ended February 29, 2020.  Restricted shares totaling 429,750 and 323,000 for the three and nine months ended February 28, 2019, respectively, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.