Selecting Fact Units and AccuraciesLast updated on 06/11/18
Each tagged number in a document must have a unit of measure and an accuracy. Each numeric concept has a predefined data type that identifies which units are acceptable. For example, concepts that are defined with a shares data type can have only a shares unit. Setting default units and accuracies automatically applies units you’ve selected based on the concept’s data type. If no default unit is set, then you must select the unit and accuracy for each fact.
Default units and accuracies are set for each XBRL Profile. If you need to change defaults, either select a different XBRL profile or see Setting Default Units and Accuracies.
Keep in mind:
All XBRL concepts have a data type, such as monetary, percent, string, or boolean.
Each concept type determines which units you can use for that fact.
Commonly Used Units
The available standard, predefined units include the following:
- Common currencies
- Number, such as percentages, rates, and ratios
NOTE: Units are predetermined based on the Unit Type Registry.
Creating a Custom Unit
If you need to use a unit that isn’t available in the default list, you can create a custom unit.
NOTE: This is available only for some taxonomies. Contact your CSM if you have any questions.
To create a custom unit:
Open the document and click Show XBRL.
Click Units on the XBRL toolbar.
Click Create New Unit and select either:
- Simple for a measure of just one type, such as number of employees.
- Ratio for complex units with a numerator and denominator, such as CAD (Canadian Dollar) per share.
NOTE: If you plan to assign the same unit to both numerator and denominator, such as USD to USD, select Simple.
Enter information for the custom unit and click the green checkmark to finish.
Selecting Units and Accuracy
When deciding on a unit, you must take into account the data type of the concept, and then use an appropriate unit.
To select a unit and accuracy for a fact:
Select the fact.
In the Fact Details panel, select the Accuracy for the fact.
Click Add Unit and use the options in the Manage Units dialog box to further narrow search results. Click a unit name to see more information about it.
Select the unit and click Apply.