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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, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Numerator for earnings per share:        
Net income attributable to RPM International Inc. stockholders $ 77,030 $ 49,224 $ 183,218 $ 118,988
Less: Allocation of earnings and dividends to participating securities (548) (460) (1,167) (936)
Net income available to common shareholders - basic 76,482 48,764 182,051 118,052
Add: Undistributed earnings reallocated to unvested shareholders 1   3  
Add: Allocation of earnings and dividends to participating securities       936
Net income available to common shareholders - diluted $ 76,483 $ 48,764 $ 182,054 $ 118,988
Denominator for basic and diluted earnings per share:        
Basic weighted average common shares 128,393 131,058 128,639 131,467
Average diluted options and awards 686 609 655 1,811
Total shares for diluted earnings per share [1] 129,079 131,667 129,294 133,278
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders:        
Basic Earnings Per Share of Common Stock $ 0.60 $ 0.37 $ 1.42 $ 0.90
Diluted Earnings Per Share of Common Stock $ 0.59 $ 0.37 $ 1.41 $ 0.89
[1] Restricted shares totaling 178,000 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 shares of restricted stock identified as being anti-dilutive for the three months ended November 30, 2019, or the three or six months ended November 30, 2018.  Stock appreciation rights (SARs) totaling 790,000 for the six months ended November 30, 2019 and 480,000 and 890,000 for the three and six months ended November 30, 2018, respectively, 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.