They aren't going to reimburse you after the fact, but if you get approval in advance many companies will reimburse for graduate programs or other courses.

There's no hard and fast rules. No, a company will never retroactively pay for you learning, but yes a number of companies will reimburse you if you attend graduate programs while employed with them.

It's a balancing act. If a company wants employees to keep learning, they need to invest in that. If I, as a salaried employee, am expected to be available outside of the explicit working hours for emergencies, then it's also fair that I be allowed to do things that are directed at my own career during work, bonus if it proves useful to the company.