There was a good in-depth article in engineering news record on this a few years ago.
It said that everyone expected pink slips when he sold the company and called everyone in for a special meeting (on like a Saturday or something).
He already had the checks printed and gave them out one at a time in one-on-one meetings. The people (80 of them) he wanted to give a million dollars to, he actually had to give about $1,500,000 to take care of taxes. He wanted them to have a million after taxes.
One employee went on to say that after this he went home and hid in the garage for hours. His wife, fearing that he lost his job, finally came in after him. That's when he showed her the check.