As others have said, as long as it is in the checked-in baggage, you should be okay. To prevent thefts, I typically wrap my knives with bubble-wrap, or newspaper, secure them with plastic tape (if it is in a box, secure the edges), and roll it in a t-shirt/trouser/whatever, by taping it inside the trouser leg/denim first. Time works absolutely against the casual thief, so until today none of my blades have been stolen. Then place them towards the bottom of your bag, with buffer below (mostly of clothes again), and then have a lot of stuff on it. You are all set.
