Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Income Statement [Abstract]
Net Sales		$ 1,022,496	$ 988,555	$ 3,465,329	$ 3,387,065
Cost of Sales		593,923	575,593	1,963,033	1,947,211
Gross Profit		428,573	412,962	1,502,296	1,439,854
Selling, General and Administrative Expenses		386,032	370,913	1,189,611	1,096,361
Goodwill and Other Intangible Asset Impairments		4,900		193,198
Interest Expense		23,769	23,140	69,452	68,078
Investment (Income), Net		(3,627)	(2,909)	(9,881)	(8,077)
Other Expense (Income), Net		502	(88)	1,301	(876)
Income Before Income Taxes		16,997	21,906	58,615	284,368
Provision for Income Taxes		4,313	2,613	2,793	80,564
Net Income		12,684	19,293	55,822	203,804
Less: Net Income Attributable to Noncontrolling Interests		756	711	2,051	1,974
Net Income Attributable to RPM International Inc. Stockholders		$ 11,928	$ 18,582	$ 53,771	$ 201,830
Average Number of Shares of Common Stock Outstanding:
Basic		130,677	129,068	130,657	129,506
Diluted	[1]	130,677	129,068	130,657	136,848
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders:
Basic		$ 0.09	$ 0.14	$ 0.41	$ 1.53
Diluted		0.09	0.14	0.41	1.50
Cash Dividends Declared per Share of Common Stock		$ 0.300	$ 0.275	$ 0.875	$ 0.810

[1] Restricted shares totaling 1,676,404 and 919,918 for the three and nine months ended February 29, 2016, respectively, were excluded from the calculation of diluted earnings per share because the grant price of the restricted shares exceeded the average market price of the shares during the period and their effect, accordingly, would have been anti-dilutive. There were no restricted shares identified as being anti-dilutive for the three and nine months ended February 28, 2017. In addition, stock appreciation rights (SARs) totaling 600,000 for the three and nine months ended February 28, 2017 and 1,140,000 for the three and nine months ended February 29, 2016 were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.