  The Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) has been conducted
over a five-year period at the CFHT with the MegaCam instrument, totaling 450
nights of observations. The Wide Synoptic Survey is one component of the
CFHTLS, covering 155 square degrees in four patches of 23 to 65 square degrees
through the whole MegaCam filter set (u*, g', r', i', z') down to i'$_{AB}$ =
24.5. With the motivation of searching for high-redshift quasars at redshifts
above 6.5, we extend the multi-wavelength CFHTLS-Wide data in the Y-band down
to magnitudes of $\sim$ 22.5 for point sources (5$\sigma$). We observed the
four CFHTLS-Wide fields (except one quarter of the W3 field) in the Y-band with
the WIRCam instrument at the CFHT. Each field was visited twice, at least three
weeks apart. Each visit consisted of two dithered exposures. The images are
reduced with the Elixir software used for the CFHTLS and modified to account
for the properties of near-InfraRed (IR) data. Two series of image stacks are
subsequently produced: four-image stacks for each WIRCam pointing, and
one-square-degree tiles matched to the format of the CFHTLS data release.
Photometric calibration is performed on stars by fitting stellar spectra to
their CFHTLS photometric data and extrapolating their Y-band magnitudes. We
measure a limiting magnitude of Y$_{AB} \simeq 22.4$ for point sources
(5$\sigma$) in an aperture diameter of 0.93", over 130 square degrees. We
produce a multi-wavelength catalogue combining the CFHTLS-Wide optical data
with our CFHQSIR (Canada-France High-z quasar survey in the near-InfraRed)
Y-band data. We derive the Y-band number counts and compare them to the VIDEO
survey. We find that the addition of the CFHQSIR Y-band data to the CFHTLS
optical data increases the accuracy of photometric redshifts and reduces the
outlier rate from 13.8% to 8.8% in the redshift range 1.05 $\lesssim$ z
$\lesssim$ 1.2.
