The NASA article[1] has a better write up and says:
While the crew will be able to move the supplies out of the interior, pressurized compartment of the Dragon without leaving the station, the robotic arm will be called on to pull the IDA from the trunk and maneuver it near the port where it will be connected. NASA astronauts currently living aboard the station will perform a spacewalk later this summer to make the final connection of the IDA to the Harmony module.
While the crew will be able to move the supplies out of the interior, pressurized compartment of the Dragon without leaving the station, the robotic arm will be called on to pull the IDA from the trunk and maneuver it near the port where it will be connected. NASA astronauts currently living aboard the station will perform a spacewalk later this summer to make the final connection of the IDA to the Harmony module.
1. http://www.nasa.gov/feature/spacex-crs-9-carrying-crucial-po...