cm:Concept: us-gaap:SaleOfStockDeferredIncomeTaxProvisionOnGainLossRecognized
| Sale of Stock, Deferred Income Tax Provision on Gain (Loss) Recognized [true false] |
| us-gaap:SaleOfStockDeferredIncomeTaxProvisionOnGainLossRecognized |
| The disclosure of the statement as to whether a provision for deferred income taxes has been provided for gains recognized on the stock transaction. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SaleOfStockDeferredIncomeTaxProvisionOnGainLossRecognized |