He's the type who doesn't worry about details.
人って 大ざっぱな 性格だからね。
Ano hito tte ōzappana seikaku da kara ne.
that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)
man; person; human being; mankind; people; human (Homo sapiens); humans as a species; character; personality; man of talent; true man; another person; other people; others; adult
casual quoting particle; indicates supposition; if ... then; indicates a rhetorical question; indicates certainty, insistence, etc.
rough (as in not precise); broad; sketchy
character; personality; disposition; nature
be; is; indicates past or completed action; indicates light imperative
from (e.g. time, place, numerical quantity); since; from (originator); by; because; since; out of (constituent, part); through (e.g. window, vestibule); after; since
indicates emphasis, agreement, request for confirmation, etc.; is it so; hey; come on; listen; not