Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Income Statement [Abstract]
Net Sales		$ 1,401,292	$ 1,362,531	$ 2,874,056	$ 2,822,520
Cost of Sales		871,894	868,800	1,769,904	1,779,436
Gross Profit		529,398	493,731	1,104,152	1,043,084
Selling, General and Administrative Expenses		403,357	385,842	803,923	800,895
Restructuring Charges		4,801	7,724	11,423	27,800
Interest Expense		26,341	23,127	54,658	47,533
Investment (Income) Expense, Net		(8,805)	7,033	(14,190)	4,600
Other Expense, Net		1,951	3,412	3,736	3,725
Income Before Income Taxes		101,753	66,593	244,602	158,531
Provision for Income Taxes		24,431	17,420	60,784	39,172
Net Income		77,322	49,173	183,818	119,359
Less: Net Income (Loss) Attributable to Noncontrolling Interests		292	(51)	600	371
Net Income Attributable to RPM International Inc. Stockholders		$ 77,030	$ 49,224	$ 183,218	$ 118,988
Average Number of Shares of Common Stock Outstanding:
Basic		128,393	131,058	128,639	131,467
Diluted	[1]	129,079	131,667	129,294	133,278
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.60	$ 0.37	$ 1.42	$ 0.90
Diluted		$ 0.59	$ 0.37	$ 1.41	$ 0.89

[1] Restricted shares totaling 178,000 for the six months ended November 30, 2019, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.  There were no shares of restricted stock identified as being anti-dilutive for the three months ended November 30, 2019, or the three or six months ended November 30, 2018.  Stock appreciation rights (SARs) totaling 790,000 for the six months ended November 30, 2019 and 480,000 and 890,000 for the three and six months ended November 30, 2018, respectively, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive. There were no SARs identified as being anti-dilutive for the three months ended November 30, 2019.