  We present a measurement of the fraction of Lyman $\alpha$ (Ly$\alpha$)
emitters ($X_{\rm{Ly} \alpha}$) amongst HST continuum-selected galaxies at
$3<z<6$ with the Multi-Unit Spectroscopic Explorer (MUSE) on the VLT. Making
use of the first 24 MUSE-Wide pointings in GOODS-South, each having an
integration time of 1 hour, we detect 100 Ly$\alpha$ emitters and find
$X_{\rm{Ly} \alpha}\gtrsim0.5$ for most of the redshift range covered, with 29
per cent of the Ly$\alpha$ sample exhibiting rest equivalent widths (rest-EWs)
$\leq$ 15\AA. Adopting a range of rest-EW cuts (0 - 75\AA), we find no evidence
of a dependence of $X_{\rm{Ly} \alpha}$ on either redshift or UV luminosity.
