What is the period of Python numpy.random.randint?

I am looking for some more detailed technical details regarding the implementation of Numpy's randint() function.

Specifically details regarding the period or implementation would be great. I didn't find anything in the documentation other than a note saying that new code should use a different module.

I wonder if that is because the quality of the implementation of randint() is quite poor / basic?

This question has come about as I am seeing some slightly strange results in some random data generation process.