XML 66 R78.htm IDEA: XBRL DOCUMENT
v3.19.3

Goodwill - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 Segment ReportingUnit | May 31, 2019 Segment
Goodwill [Line Items] |  |
Number of operating segments | Segment | 4 |
Industrial Segment |  |
Goodwill [Line Items] |  |
Number of operating segments | Segment |  | 2
2020 MAP to Growth | Specialty Segment | Wood Finishes Group |  |
Goodwill [Line Items] |  |
Number of reporting units split into after realignment | ReportingUnit | 2 |
2020 MAP to Growth | Specialty Segment | Kop-Coat Group |  |
Goodwill [Line Items] |  |
Number of reporting units split into after realignment | ReportingUnit | 2 |

X
- Definition Number of reporting units split into after realignment. + References No definition available. + Details
Name: | rpm_NumberOfReportingUnitsSplitIntoAfterRealignment
Namespace Prefix: | rpm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rpm_IndustrialSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=rpm_TwoThousandAndTwentyMarginAccelerationPlanToGrowthPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rpm_SpecialtySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=rpm_WoodFinishesGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=rpm_KopCoatGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |