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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share, Calculated using Two-Class Method (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Numerator for earnings per share:        
Net income attributable to RPM International Inc. stockholders $ (42,356) $ 6,625 $ 33,225 $ 133,367
Less: Allocation of earnings and dividends to participating securities     (510) (2,441)
Net income available to common shareholders - basic (42,356) 6,625 32,715 130,926
Add: Undistributed earnings reallocated to unvested shareholders     (8) 4
Net income available to common shareholders - diluted $ (42,356) $ 6,625 $ 32,707 $ 130,930
Denominator for basic and diluted earnings per share:        
Basic weighted average common shares 129,013 [1] 128,121 [1] 128,900 [1] 128,072 [1]
Average diluted options   2,256 822 555
Net issuable common share equivalents            
Total shares for diluted earnings per share 129,013 [2] 130,377 [2] 129,722 [2] 128,627 [2]
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders:        
Basic Earnings Per Share of Common Stock $ (0.33) $ 0.05 $ 0.25 $ 1.02
Diluted Earnings Per Share of Common Stock $ (0.33) $ 0.05 $ 0.25 $ 1.02
[1] For the three month period ended February 28, 2013, basic weighted-average shares outstanding are used in calculating diluted earnings per share as a result of the reported loss for the period. For the three month period ended February 29, 2012, approximately 2,811,000 shares of stock granted under stock-based compensation plans were excluded from the calculation of diluted EPS, as the effect would have been anti-dilutive.
[2] For the nine month periods ended February 28, 2013 and February 29, 2012, approximately 3,063,000 shares and 2,618,000 shares of stock, respectively, granted under stock-based compensation plans were excluded from the calculation of diluted EPS for those periods, as the effect would have been anti-dilutive.