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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
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Aug. 31, 2012 | Aug. 31, 2011
Numerator for earnings per share: |  |  |  |
Net income attributable to RPM International Inc. Stockholders | $ 26,665 | [1] | $ 76,811 |
Less: Allocation of earnings and dividends to participating securities | (479) | [1] | (1,530) |
Net income available to common shareholders - basic | 26,186 | [1] | 75,281 |
Add: Undistributed earnings reallocated to unvested shareholders |  |  | 4 |
Net income available to common shareholders - diluted | $ 26,186 | [1] | $ 75,285 |
Denominator for basic and diluted earnings per share: |  |  |  |
Basic weighted average common shares | 128,805 | [1] | 128,094 |
Average diluted options | 765 | [1] | 532 |
Total shares for diluted earnings per share | 129,570 | [1] | 128,626 |
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders: |  |  |  |
Basic Earnings Per Share of Common Stock | $ 0.20 | [1] | $ 0.59 |
Diluted Earnings Per Share of Common Stock | $ 0.20 | [1],[2] | $ 0.59 | [2]
[1] | Restated
[2] | For the quarters ended August 31, 2012 and 2011, approximately 2,954,000 and 2,750,000 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.

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