Originally Posted by Gavin B.

The Idiot came out in early 1977 which is a bit too early to be post punk. In fact The Idiot came out a few months before the Sex Pistols released Never Mind the Bullocks. That would make The Idiot pre-punk by most people's standards.

The Sex Pistols imploded during their American tour in January 1978, which is generally considered to be the end of the punk era.