In The Books Meaning

(idiomatic) Finished; concluded; able to be regarded as a matter of record.

Example: 1982 Feb. 3, Bob Ryan, "Parish spruces up Celtics, 109-105," Boston Globe p. S-1 (retrieved 18 March 2013):
  Two Bird swishes and a Johnny Davis three-point air ball later, the victory was in the books.
1998 May 25, Ted Geltner, "Ocala's Peggy Takacs Wins Big With Oscar Picks," Ocala Star-Banner, p. 1C (retrieved 19 March 2013):
  The 1998 Academy Awards ceremony is in the books, and now that we have had a chance to reflect on the big event, we can put the proceedings in some context.
2008 Oct. 17, Alex Altman, "The Bradley Effect," Time:
  With the presidential debates in the books and a commanding lead in the polls, Barack Obama appears to be coasting toward history.