The most important investment of any company is to improve the efficiency and proficiency of its employees. All of the best ideas and innovations come from people who see and experience the problems that the business faces. Thus, it only makes sense that training those people in order to be able to come up with those ideas is highly important.
Big companies should always strive to continue the education of their employees. Not only does this increase productivity and employee skill sets, but it also prepares employees already within the company to move up, which is beneficial since they are already aware of how the company operates and can be an asset to the team.