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Earnings Per Share (Tables) | 6 Months Ended
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Nov. 30, 2015
Earnings Per Share [Abstract] |
Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share Calculated using Two-Class Method | The following table sets forth the reconciliation of the numerator and denominator of basic and diluted earnings per share, as calculated using the two-class method for the three and six month periods ended November 30, 2014. For the three and six month periods ended November 30, 2015, basic earnings per share were calculated using the two-class method, while diluted earnings per share were calculated using the treasury method, as the results under the two-class method were less dilutive.
|  | Three Months Ended |  |  | Six Months Ended |
|  | November 30, |  |  | November 30, |
(In thousands, except per share amounts) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Numerator for earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to RPM International Inc. stockholders |  | $ | 83,433 |  |  | $ | 69,766 |  |  | $ | 183,248 |  |  | $ | 168,845 |
Less: Allocation of earnings and dividends to participating securities |  |  | (1,571 | ) |  |  | (1,602 | ) |  |  | (3,068 | ) |  |  | (3,673 | )
Net income available to common shareholders - basic |  |  | 81,862 |  |  |  | 68,164 |  |  |  | 180,180 |  |  |  | 165,172 |
Add: Undistributed earnings reallocated to unvested shareholders |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  | 18 |
Reverse: Allocation of earnings and dividends to participating securities |  |  | 1,571 |  |  |  |  |  |  |  | 3,068 |  |  |  |  |
Add: Income effect of contingently issuable shares |  |  | 1,354 |  |  |  | 1,340 |  |  |  | 2,706 |  |  |  | 2,679 |
Net income available to common shareholders - diluted |  | $ | 84,787 |  |  | $ | 69,510 |  |  | $ | 185,954 |  |  | $ | 167,869 |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares |  |  | 129,398 |  |  |  | 130,028 |  |  |  | 129,723 |  |  |  | 130,061 |
Average diluted options |  |  | 3,453 |  |  |  | 1,063 |  |  |  | 3,466 |  |  |  | 1,064 |
Additional shares issuable assuming conversion of convertible securities |  |  | 3,883 |  |  |  | 3,875 |  |  |  | 3,883 |  |  |  | 3,875 |
Total shares for diluted earnings per share (1), (2) |  |  | 136,734 |  |  |  | 134,966 |  |  |  | 137,072 |  |  |  | 135,000 |
Earnings Per Share of Common Stock Attributable to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RPM International Inc. Stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share of Common Stock |  | $ | 0.63 |  |  | $ | 0.52 |  |  | $ | 1.39 |  |  | $ | 1.27 |
Diluted Earnings Per Share of Common Stock |  | $ | 0.62 |  |  | $ | 0.52 |  |  | $ | 1.36 |  |  | $ | 1.24 |
(1) | For the three months ended November 30, 2014, approximately 3.2 million 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 six months ended November 30, 2014, approximately 3.0 million 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.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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