Subsequent Events	9 Months Ended
Feb. 28, 2019
Subsequent Events [Abstract]
Subsequent Events	NOTE 17 — SUBSEQUENT EVENTS As of April 8, 2019, we have repurchased 467,862 shares of RPM common stock since February 28, 2019, at a cost of approximately $27.0 million, or an average of $57.71, under the stock repurchase program described in Note 11.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration