Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013		Aug. 31, 2012
Net Sales	$ 1,164,674		$ 1,046,714
Cost of Sales	665,602		612,834
Gross Profit	499,072		433,880
Selling, General and Administrative Expenses	335,459		310,940
Interest Expense	20,725		18,430
Investment (Income), Net	(3,894)		(6,974)
Other (Income) Expense, Net	(434)		39,422
Income Before Income Taxes	147,216		72,062
Provision for Income Taxes	40,327		34,195
Net Income	106,889		37,867
Less: Net Income Attributable to Noncontrolling Interests	3,791		3,954
Net Income Attributable to RPM International Inc. Stockholders	$ 103,098		$ 33,913
Average Number of Shares of Common Stock Outstanding:
Basic	129,344		128,805
Diluted	130,294		129,570
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders
Basic	$ 0.78		$ 0.26
Diluted	$ 0.77	[1]	$ 0.26	[1]
Cash Dividends Declared per Share of Common Stock	$ 0.225		$ 0.215

[1] For the quarters ended August 31, 2013 and 2012, approximately 3,097,000 and 2,954,000 shares of stock, respectively, granted under stock-based compensation plans were excluded from the calculation of diluted earnings per share, as the effect would have been anti-dilutive.