cm:Level1TextBlock: us-gaap:SaleLeasebackTransactionDisclosureTextBlock
| Sale Leaseback Transactions [Text Block] |
| us-gaap:SaleLeasebackTransactionDisclosureTextBlock |
| The entire disclosure for sale leaseback transaction. Includes, but is not limited to, terms and conditions of transaction and gain (loss) from transaction. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SaleLeasebackTransactionDisclosureTextBlock |
| SaleLeasebackTransactionDisclosure |