Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Aug. 31, 2019	Aug. 31, 2018
Income Statement [Abstract]
Net Sales		$ 1,472,764	$ 1,459,989
Cost of Sales		898,010	910,636
Gross Profit		574,754	549,353
Selling, General and Administrative Expenses		400,566	415,053
Restructuring Charges		6,622	20,076
Interest Expense		28,317	24,406
Investment (Income), Net		(5,385)	(2,433)
Other Expense, Net		1,785	313
Income Before Income Taxes		142,849	91,938
Provision for Income Taxes		36,353	21,752
Net Income		106,496	70,186
Less: Net Income Attributable to Noncontrolling Interests		308	422
Net Income Attributable to RPM International Inc. Stockholders		$ 106,188	$ 69,764
Average Number of Shares of Common Stock Outstanding:
Basic		128,882	131,861
Diluted	[1]	129,504	136,430
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.82	$ 0.52
Diluted		$ 0.82	$ 0.52

[1] Restricted shares totaling 178,000 and 126,750 for the three months ended August 31, 2019 and 2018, 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  790,000 for the three months ended August 31, 2019 and 890,000 for the three months ended August 31, 2018, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.