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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | [1] | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2017 | May 31, 2016 | May 31, 2015
Numerator for earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to RPM International Inc. stockholders |  | $ 128,052 | $ 11,928 | $ (70,926) | $ 112,769 | $ 152,895 | $ 18,582 | $ 83,433 | $ 99,815 | $ 181,823 | $ 354,725 | $ 239,484
Less: Allocation of earnings and dividends to participating securities |  |  |  |  |  |  |  |  |  | (2,795) | (5,770) | (4,954)
Net income available to common shareholders - basic |  |  |  |  |  |  |  |  |  | 179,028 | 348,955 | 234,530
Add: Undistributed earnings reallocated to unvested shareholders |  |  |  |  |  |  |  |  |  | 2 |  | 18
Reverse: Allocation of earnings and dividends to participating securities |  |  |  |  |  |  |  |  |  |  | 5,770 |
Add: Income effect of contingently issuable shares |  |  |  |  |  |  |  |  |  | 5,457 | 5,430 | 5,374
Net income available to common shareholders - diluted |  |  |  |  |  |  |  |  |  | $ 184,487 | $ 360,155 | $ 239,922
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares | [2] |  |  |  |  |  |  |  |  | 130,662 | 129,383 | 129,933
Average diluted options |  |  |  |  |  |  |  |  |  | 598 | 3,445 | 1,082
Net issuable common share equivalents | [3] |  |  |  |  |  |  |  |  | 3,905 | 3,888 | 3,878
Total shares for diluted earnings per share | [2] |  |  |  |  |  |  |  |  | 135,165 | 136,716 | 134,893
Earnings per Share of Common Stock Attributable to RPM International Inc. Stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share of Common Stock |  | $ 0.96 | $ 0.09 | $ (0.54) | $ 0.85 | $ 1.16 | $ 0.14 | $ 0.63 | $ 0.76 | $ 1.37 | $ 2.70 | $ 1.81
Diluted Earnings Per Share of Common Stock |  | $ 0.94 | $ 0.09 | $ (0.54) | $ 0.83 | $ 1.13 | $ 0.14 | $ 0.62 | $ 0.74 | $ 1.36 | $ 2.63 | $ 1.78
[1] | Reflects the pretax goodwill and intangible asset impairment losses of $188.3 million related to our Kirker reporting unit. Refer to Note B, “Goodwill and Other Intangible Assets,” for further information. Also reflects $12.3 million pretax charge relating to the Flowcrete decision to exit the Middle East.
[2] | Basic and diluted earnings per share are calculated using the two-class method for the years ended May 31, 2017 and 2015. For the year ended May 31, 2016, basic and diluted earnings per share are calculated under the two-class method and the treasury method, respectively, as those methods resulted in the most dilutive earnings per share.
[3] | 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.

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