Gidley, the man chosen to fill the considerable boots of 2005 Man of Steel Jamie Lyon, experienced a slow start to his English career but he made his mark with a hat-trick of tries at a sell-out Halliwell Jones Stadium.
Back-to-back defeats by Harlequins RL and Wakefield Trinity Wildcats are a distant memory after the Carnegie World Club Champions followed up their clinical destruction of Bradford Bulls with an even more impressive rout of Warrington Wolves.
The hosts had the chance to go top themselves for the first time in the summer era after winning three of their opening four matches but they never seriously looked like ending their dismal run against their local rivals.
A brief revival just before half-time, when they scored two tries in four minutes, gave them a lifeline but they have now won just once in 28 Super League derbies.
Saints were boosted by the return of forwards Mike Bennett and Maurie Fa