  We give an overview of the baseline detector system for SAFARI, the prime
focal-plane instrument on board the proposed space infrared observatory, SPICA.
SAFARI's detectors are based on superconducting Transition Edge Sensors (TES)
to provide the extreme sensitivity (dark NEP$\le2\times10^{-19}\rm\ W/\sqrt
Hz$) needed to take advantage of SPICA's cold (<8 K) telescope. In order to
read out the total of ~3500 detectors we use frequency domain multiplexing
(FDM) with baseband feedback. In each multiplexing channel, a two-stage SQUID
preamplifier reads out 160 detectors. We describe the detector system and
discuss some of the considerations that informed its design.
