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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
Aug. 31, 2014
Aug. 31, 2013
Numerator for earnings per share:    
Net income attributable to RPM International Inc. stockholders $ 99,079 $ 103,098
Less: Allocation of earnings and dividends to participating securities (2,179) (2,285)
Net income available to common shareholders - basic 96,900 100,813
Add: Undistributed earnings reallocated to unvested shareholders 12 12
Add: Income effect of contingently issuable shares 1,339  
Net income available to common shareholders - diluted $ 98,251 $ 100,825
Denominator for basic and diluted earnings per share:    
Basic weighted average common shares 130,094 129,344
Average diluted options 1,065 950
Net issuable common share equivalents 3,873 [1]  
Total shares for diluted earnings per share 135,032 130,294
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders:    
Basic $ 0.74 $ 0.78
Diluted $ 0.73 [2] $ 0.77 [2]
[1] For the quarter ended August 31, 2014, represents the number of shares that would be issued if our contingently convertible notes were converted. We include these shares in the calculation of diluted EPS as the conversion of the notes may be settled, at our election, in cash, shares of our common stock, or a combination of cash and shares of our common stock.
[2] For the quarters ended August 31, 2014 and 2013, approximately 3,034,000 and 3,097,000 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.