cm:Concept: us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRollingYearFour
| Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four |
| us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRollingYearFour |
| Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRollingYearFour |