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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 | 12 Months Ended
--- | --- | ---
May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2013 | May 31, 2012 | May 31, 2011
Numerator for earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to RPM International Inc. Stockholders | $ 65,378 | [1] | $ (42,356) | [2] | $ 41,668 | [3] | $ 33,913 | [4] | $ 82,569 | $ 6,625 | $ 49,931 | $ 76,811 | $ 98,603 | $ 215,936 | $ 189,058
Less: Allocation of earnings and dividends to participating securities |  |  |  |  |  |  |  |  |  |  |  |  | (1,999) | (4,024) | (3,067)
Net income available to common shareholders-basic |  |  |  |  |  |  |  |  |  |  |  |  | 96,604 | 211,912 | 185,991
Add: Undistributed earnings reallocated to unvested shareholders |  |  |  |  |  |  |  |  |  |  |  |  | (3) | 9 | 7
Net income available to common shareholders-diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 96,601 | $ 211,921 | $ 185,998
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares |  |  |  |  |  |  |  |  |  |  |  |  | 128,956 | 128,130 | 127,403
Average diluted options |  |  |  |  |  |  |  |  |  |  |  |  | 845 | 587 | 663
Total shares for diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  | 129,801 | 128,717 | 128,066
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share of Common Stock | $ 0.49 | [1] | $ (0.33) | [2] | $ 0.32 | [3] | $ 0.26 | [4] | $ 0.63 | $ 0.05 | $ 0.38 | $ 0.59 | $ 0.75 | $ 1.65 | $ 1.46
Diluted Earnings Per Share of Common Stock | $ 0.49 | [1] | $ (0.33) | [2] | $ 0.31 | [3] | $ 0.26 | [4] | $ 0.63 | $ 0.05 | $ 0.38 | $ 0.59 | $ 0.74 | $ 1.65 | $ 1.45
[1] | For the quarter ended May 31, 2013, we recorded $23.9 million in restructuring expense, including $3.9 million in inventory markdowns. We also recorded bad debt for the remaining amount of our loan to Kemrock totaling $4.0 million and wrote off our remaining investment in Kemrock common stock and in Kemrock convertible debt for a combined loss of $18.5 million. Additionally, we reduced our estimated accrual for our agreement in principle with the GSA by $3.7 million. The combined impact of these items on net income and earnings per share for the fourth quarter was $30.0 million and $0.23 per share, respectively.
[2] | For the quarter ended February 28, 2013, we accrued a loss of $68.8 million for a proposed settlement between our Building Solutions Group and the General Services Administration ("GSA"). Additionally, net income was impacted by $1.6 million for the impact of a strategic repositioning of certain industrial segment operations in Brazil. The combined impact of these items on net income and earnings per share for the third quarter was $51.0 million and $0.40 per share, respectively.
[3] | For the quarter ended November 30, 2012, we wrote down our remaining investment in Kemrock, which impacted net income and earnings per share by $10.8 million and $0.09 per share, respectively.
[4] | For the quarter ended August 31, 2012, net sales and gross profit were reduced by $2.9 million and $5.4 million, respectively, for revised cost estimates on unprofitable contracts related to our industrial segment, and $5.6 million in exit costs associated with those activities that impacted pretax income. Additionally, we wrote down an investment in Kemrock totaling $40.3 million and recognized $5.0 million in bad debt from our loan to Kemrock. The combined impact on net income and earnings per share was $50.9 million and $0.38 per share, respectively.

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