Apple has lately been moving away from Samsung and reportedly stroke a deal with TSMC for the upcoming A11 chip. Qualcomm and Nvidia on the other hand are said to be relying on Samsung's manufacturing process with their upcoming high-end chips.
Semiconductors and especially memory chips have been a good business for Samsung for a while. They most recently kept Samsung afloat while problems with smartphone business has stalled the growth in last quarter. This will further advance Samsung's stability as they aim to retake smartphone business growth.