Detailed (adjective) means
having too many details
example: a detailed answer
What does this details mean in the definition of the adjective Detailed?
Since the noun detail has two meanings:
1.an individual fact or item
2.a minor, less significant point
In my interpretation
#1 and #2 mean the same thing as
When someone alleges rape, the interrogator may ask for lots of "details" such what time was it, what were you wearing, what colour was the attacker's shoes, how did you get home afterwards, etc.
These details could be seen as "mere details" compared with the main fact, but those details could be extremely important as evidence of truthfulness or in identifying the actual attacker.