that's the ticket
That is exactly the thing that is or was needed or called for. That's the ticket, yes, please lie down. A short nap will have you refreshed in no time. That's the ticket, Chuck. Great idea!
That's the ticket!
Inf. That is what is required! Mary: I'll just get ready and drive the package directly to the airport! Sue: That's the ticket. Take it right to the airport post office. Bob: I've got it! I'll buy a new computer! Bill: That's the ticket!