Certain axes in the US GAAP taxonomy should only have certain members as shown in the US GAAP taxonomy. This rule tests whether these axes have inappropriate members.
The XBRL US Data Quality Committee has approved and published validation rules listed below to help public companies detect inconsistencies or errors in their XBRL-formatted financial data. The rules identify potential errors such as incorrect negative values, improper relationships between elements, and incorrect dates associated with certain data. The Committee approved these rules after considering comments received during a 60 day public review period.
The rules are freely available and can be accessed through XBRL service providers whose incorporation of the rules in their software tool has been approved by the XBRL US Center for Data Quality. When the rules identify a potential error, they provide detailed information on the potential error with guidance on how to correct it.
Approved Guidance and Validation Rules - RSS
Assets equal liabilities plus shareholders’ equity.
Dates that end after reporting period end dates are limited to subsequent events, forecasts and Entity Common Stock, Shares Outstanding.
Document and entity information, footnotes, tables, and accounting policy concepts must use reporting period dates that are consistent with the fiscal period focus of the filing (e.g. Q1, Q2, Q3 or FY).
Value for element A should be less than or equal to the value for element B. Documentation includes a list of elements where this comparison is tested.
The US GAAP Taxonomy is designed so that the majority of elements have a positive value. This rule tests that the values for a given list of elements are negative when a precondition is met for another element.
The US GAAP Taxonomy is designed so that the majority of elements have a positive value. This rule tests that the values for a given list of elements with no dimensions are negative. If the value has a dimension member, then the rule will not fire.
Elements that should not be reported with negative values. Documentation includes a list of elements tested.
This rule evaluates if the company has used a deprecated element in the filing. The rule specifically checks if a deprecated element is included in the presentation relationship defined in the company’s extension taxonomy. Deprecated elements are determined by taking all children of the “DeprecatedItems” element defined in the presentation tree of the US GAAP taxonomy. Errors are reported for each deprecated element, including errors for each line item with an associcated deprecated member or axis.
Document and entity information dates should match the document period end date.
The document period end date should match the date tagged with the document period end date element.
This rule evaluates whether the dimension default is associated with a given axis in the company’s extension taxonomy. Companies should not change the default member defined in the US GAAP Taxonomy for a given axis in their extension taxonomy.
Certain axes in the US GAAP taxonomy should only have certain members, otherwise consumption of the data is adversely impacted because the resulting axis and member combinations are nonsensical, e.g., reporting a type of currency as a member on a debt instrument axis. The following guidance provides limitations on the use of certain axis and member combinations that should be adhered to when tagging financial information using the US GAAP Taxonomy.