in detail
With a large amount of details; very explicitly or thoroughly. I explained in detail how the proposed system would work, but I think I may have confused some people in the audience.
in detail
with lots of details; giving all the details. (Often used with an adjective showing the level of detail, such as great, enormous, etc., as in the second example.) I explained the policy to the customer in detail. We planned the entire project in great detail.
in detail
With close attention to particulars; thoroughly. For example, She explained her theory in detail. It is also put as go into detail, meaning "to investigate thoroughly," as in You know what I mean, so I needn't go into detail. The first expression dates from about 1600, the second from the late 1800s.
in detail
With attention to particulars; thoroughly or meticulously: explained her proposal in detail.