A coup is a pretty major achievement, whether it involves taking over a government by force, or landing a major business contract.
When the word coup is used on the nightly news, it's usually describing a military government takeover. In the business section of the daily newspaper, coup might refer to a big corporation landing an important contract or deal. However you use the word coup, don't say the "p" at the end. It's not pronounced like chicken coop. It sounds more like a dove's coo.