BC stated at the time of purchase that they wanted to reduce operating costs from 2.1 Billion to 900 million (almost 60%). Not hard to figure how that gets done. CA let 8% go about 6 weeks before the acquisition to clean up the balance sheet. That lay off was HEAVILY focused on people in the 50+ age bracket to the point they were really worried about law suits. Then 40 to 50% of the remaining went in the first year followed done in sets. Then 10% and 10% in each of the two years after. Now, 4 years later there's about 20% or less of CA left. Started at 10,500, now around 2,000 and every system and process was replaced.
I found this on CA Technologies page. It's good info that can clear things up for some people. This is the thread where it was posted: https://www.thelayoff.com/t/1gSVvcg5