Does Marxism draw any [relevant] conclusions from materialism?
Of course. One of the tenets of Marxism is that social being determines social consciousness, not vice versa. This is textbook materialism. Anything else simply leads to liberalism, religion, etc.
the idealist schools of thought that only recognise material and non-material mental stuff
You seem confused. There are two main currents in philosophy - materialism, which posits that nature is primary to spirit, being is primary to thought, and idealism, which posits the opposite. In between the two there are agnostics, who claim this question is impossible to answer. This has nothing to do with whether a philosophy "recognizes non-material stuff".
Of course. One of the tenets of Marxism is that social being determines social consciousness, not vice versa. This is textbook materialism. Anything else simply leads to liberalism, religion, etc.
You seem confused. There are two main currents in philosophy - materialism, which posits that nature is primary to spirit, being is primary to thought, and idealism, which posits the opposite. In between the two there are agnostics, who claim this question is impossible to answer. This has nothing to do with whether a philosophy "recognizes non-material stuff".