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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 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Numerator for earnings per share:        
Net income attributable to RPM International Inc. stockholders $ 127,659 $ 77,030 $ 308,254 $ 183,218
Less: Allocation of earnings and dividends to participating securities (1,130) (548) (2,517) (1,167)
Net income available to common shareholders - basic 126,529 76,482 305,737 182,051
Add: Undistributed earnings reallocated to unvested shareholders 4 1 9 3
Net income available to common shareholders - diluted $ 126,533 $ 76,483 $ 305,746 $ 182,054
Denominator for basic and diluted earnings per share:        
Basic weighted average common shares 128,500 128,393 128,459 128,639
Average diluted options and awards 590 686 619 655
Total shares for diluted earnings per share [1] 129,090 129,079 129,078 129,294
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders:        
Basic Earnings Per Share of Common Stock $ 0.98 $ 0.60 $ 2.38 $ 1.42
Method used to calculate basic earnings per share Two-class Two-class Two-class Two-class
Diluted Earnings Per Share of Common Stock $ 0.98 $ 0.59 $ 2.37 $ 1.41
Method used to calculate diluted earnings per share Two-class Two-class Two-class Two-class
[1] Restricted shares totaling 225,500 and 339,550 for the three and six months ended November 30, 2020, respectively and 178,000 the six months ended November 30, 2019, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive. There were no shares of restricted stock identified as being anti-dilutive for the three months ended November 30, 2019.  In addition, stock appreciation rights (“SARs”) totaling 360,000 and for the three and six months ended November 30, 2020, respectively, and 790,000 for the six months ended November 30, 2019, were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.  There were no SARs identified as being anti-dilutive for the three months ended November 30, 2019.