How do I distinguish a standard XBRL element from a custom extension?
In the latest XBRL taxonomy all standard data tags have the prefix “us-gaap”: us-gaap_CashAndCashEquivalentsAtCarryingValue A custom XBRL extension is identified by the prefix which reflects the company’s Exchange symbol. For example, a custom extension for XYZ Corp. would have the prefix “xyz”: xyz_FoodAndPaperCosts.
