How would I know the calculation for value return?

There are several ways on how to check calculations of returned values,  as discussed here in "Validating Value Returns".  - These are thru annotations, trace to XBRL report and checking in Financial Explorer and Document Viewer. 

However, please keep in mind that Annotations and Tracing back to XBRL Report can only be used if the value is the result of:

  1. Using any of XBRLAnalyst functions with annotations
  2. Exported report using "Simple Formulas"

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