I don't understand why you're asking this question - and I don't mean this in a rude way. Does the company want the training documents? Are you wanting to ... keep them forever? Is there some greater part to this question which allows more meaningful answers?
At the heart of your question, I have no idea who owns them. One comment notes that company laptops are the company's property, not yours. However, you could also note that a company lunch is owned by you, not the company. There is probably some legal stuff about consumption or something?
From past experience the value of a training book is Very Low after a year of the training - if you need the info the workbook isn't going to help much more than a google search or your own personal notes. If you recall the info then you're set - think of it like old lecture notes you had - are they useful to you still?
Also, anybody who didn't do the training is going to struggle to understand the notes - so the value to your co-workers is low.
But I don't understand what you're asking! Are you asking "can I keep these notes at home?" or "do I have to turn them over because my boss asked me to" or "can I start my online notes-sharing company with these notes" or something else? Because right now you're just asking a Very Specific legal question to which the answer is:
check your employment contract and any agreements you signed when you took the course and the copyright on the notes and hire a lawyer and get a legal opinion.