on the back of (something)
In immediate succession after something else has happened and/or as a result of it. On the back of their first album's unexpected success, the band began receiving offers to play gigs all over the world.
on the back of
following on from (and perhaps as a consequence of). 2002 Irish Examiner After the Vatican called in the Israeli and American ambassadors for talks yesterday, and with world oil prices rising on the back of the soaring Middle East crisis, US President George Bush finally relented to mounting international pressure.