When at least one of the underlying values of `MaintenanceExpenses` is reported `MaintenanceExpenses` SHOULD also be reported. `MaintenanceExpenses` SHOULD be equal to the summation of the underlying values. `MaintenanceExpenses` reported with `ClassesOfMaintenanceExpensesAxis` and `TotalMaintenanceActivitiesMember` SHOULD be equal to `MaintenanceExpenses` without `ClassesOfMaintenanceExpensesAxis` and `TotalMaintenanceActivitiesMember`. `TotalMaintenanceActivitiesMember` SHOULD be equal to the summation of the underlying children members.