cm:Concept: us-gaap:DebtInstrumentConvertibleAssociatedDerivativeTransactionsDescription
| Debt Instrument, Convertible, Associated Derivative Transactions, Description |
| us-gaap:DebtInstrumentConvertibleAssociatedDerivativeTransactionsDescription |
| Information about derivative transactions entered into in connection with convertible debt instruments which may be settled in cash upon conversion, including partial cash settlement. Descriptions include the terms of such transactions, how the derivative transaction(s) relate to the convertible debt instrument, the number of underlying shares and the reasons for entering into the derivative transaction(s). An example of a derivative transaction entered into in connection with the issuance of the convertible debt instrument is the purchase of call options that are expected to substantially offset changes in the fair value of the conversion option. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DebtInstrumentConvertibleAssociatedDerivativeTransactionsDescription |