NEW YORK — At the movies, idiocy never goes out of style.

Twenty years after the 1994 original, “Dumb and Dumber To” opened with $38.1 million at the weekend box office, according to studio estimates Sunday. The Universal sequel debuted almost exactly two decades after the Farrelly brothers first introduced the Jim Carrey and Jeff Daniels low-IQ duo.

“Dumb and Dumber To” edged out the animated Disney adventure “Big Hero 6,” which took in $36 million in its second week. Christopher Nolan’s sci-fi epic “Interstellar” slid to third in its second week with an estimated $29.2 million.

The top three films took up the lion share of the box office, with the no. 4 film, the romance “Beyond the Lights,” opening with a distant $6.5 million.

Overall business was up 13.6 percent on the same weekend last year. The box office was boosted by a handful of independent films including “St. Vincent” ($4 million its sixth weekend) and “Birdman” ($2.5 million in its fifth weekend) as well as the limited released debuts of “Foxcatcher” and Jon Stewart’s “Rosewater.”

Next weekend will be dominated by the release of Lionsgate’s “The Hunger Games: Mockingjay, Part 1.”

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Rentrak:

1. “Dumb and Dumber To,” $38.1 million

2. “Big Hero 6,” $36 million.

3. “Interstellar,” $29.2 million

4. “Beyond the Lights,” $6.5 million

5. “Gone Girl,” $4.6 million

6. “St. Vincent,” $4 million

7. “Fury,” $3.8 million

8. “Nightcrawler,” $3 million

9. “Ouija,” $3 million

10. “Birdman,” $2.5 million.