When an iXBRL file is created, each iXBRL file as well as each folder within the file is equipped with a hashcode. If anything is changed within the file, the hashcode changes too. That way you can compare different versions of the same file and see not only if something has been changed, but also in which section it was changed.
When you open your file in the ParsePort Platform, you can find the hashcode in the Validation Summary under "General Information". Also, if you scroll down to the "Zip content" section you can find the hash codes for the different folders within the zip package.