cm:Member: us-gaap:ChangeInAccountingPrincipleMember
| Adjustments for Change in Accounting Principle [Domain] |
| us-gaap:ChangeInAccountingPrincipleMember |
| A change from one generally accepted accounting principle to another generally accepted accounting principle when there are two or more generally accepted accounting principles that apply or when the accounting principle formerly used is no longer generally accepted. A change in the method of applying an accounting principle that is not treated as a change in accounting estimate also is considered a change in accounting principle. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ChangeInAccountingPrincipleMember |