cm:Concept: us-gaap:CapitalLeasesNetInvestmentInSalesTypeLeasesDeferredIncome
| Capital Leases, Net Investment in Sales Type Leases, Deferred Income |
| us-gaap:CapitalLeasesNetInvestmentInSalesTypeLeasesDeferredIncome |
| The remaining (unamortized) difference between the gross investment in a sales-type lease and the cost or carrying amount of the leased property as of the balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:CapitalLeasesNetInvestmentInSalesTypeLeasesDeferredIncome |