Consolidation, Noncontrolling Interests and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Feb. 28, 2013
Noncurrent Liabilities
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accrued loss reserves	$ 25.8
Current Liabilities
Organization And Summary Of Significant Accounting Policies [Line Items]
Change in accrued loss reserves	$ (25.8)

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting product liability contingencies (including adjustments for changes in estimates).

No definition available.

Name:	rpm_ProductLiabilityAccrualPreexistingIncreaseDecrease
Namespace Prefix:	rpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration