I tend to assume that everybody else in the company knows that my team works in the way it does because that's how you deliver software successfully. Often, this comes back to bite when I learn that other managers think the team should be managed differently, and because I haven't made enough efforts to sell our methodology, those managers can have more influence than I'd like.
So, as an Engineering Manager, it's not enough that everybody in your team is happy and produce. You also have to be an advocate for your team to the rest of the company.