A lot depends on who the client is - and in most cases what they are willing to pay for.
The drawings are basically a tool to enable "Someone" to construct a building.
If you're working for a builder, he may just want drawings to apply for a permit. He knows what he wants to build, how he's going to build it, and what he's going to finish it with? So he doesn't need to pay for a lot of extra drawings or details that he probably won't look at.
If you're working for a private individual, then they could want anything from permit drawings to a complete set a drawings including interior elevations of EVERY wall, and specifications to cover every piece of the construction down to the last screw - although unlikely, it is possible.
Working drawings cover anything that isn't sketch design. Sketch designs are basically concept drawings that are enough to show the customer what his dream home (or structure) is going to look like, but not how it's going to be built.
If you are only providing a drawing service, most customers - and this is a great generalization - just want to pay enough to get them a building permit and they will handle the rest themselves. In most cases the more time and effort you put into the drawings, the more money you can save the customer on site due to unforeseen items. As far as I'm concerned, the better the drawings, the better/smoother the building process will be, and the happier the customer will be in the end.