Right. What happened is that they thought there was no culture that had anything to contribute to them, so they became completely insulated.
As the West went through the Renaissance, people in the West were learning and discovering all kinds of new things, taking the best of all the societies around them and so on, Islam was in a situation where someone had to make a ruling and issue a fatwa if an idea was proposed on how to make their ships better, but that idea came from an infidel vessel.
I get it. Kind of like Ivy Leaguers from the Northeast. They can't possibly learn from anybody else -- they know everything worth knowing.