cm:Concept: us-gaap:IncreaseDecreaseInDeferredCharges
| Increase (Decrease) in Deferred Charges |
| us-gaap:IncreaseDecreaseInDeferredCharges |
| The increase (decrease) during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a period of years. Deferred charges differ from prepaid expenses in that they usually extend over a long period of time and may or may not be regularly recurring costs of operation. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:IncreaseDecreaseInDeferredCharges |