The phrase "irrelevant details" means information that is not important or necessary, and does not have any impact or significance on the main topic or situation being discussed.
However, it is not a space to include irrelevant details as this may cause your resume to be thrown into the bin. (jobdescriptionandresumeexamples.com)
In paper resumes, though, you can «hide» irrelevant details in your job application. (resumeprofessionalwriters.com)