They can't really minimize 'damage to the stock.' The markets re-open in the morning, and there's after hours trading so far as that goes. Reporting after market close just give a little breathing time for everyone to digest the earnings announcement and conference call information. Whatever it all is will either damage or enhance the value of the shares tomorrow.
It's hard to say, at this point it could be just a change in how earnings will be reported in the future. Distance the new CEO as far from Steve Burd operating style as possible, I'm not sure what Edwards experience in the food industry is, bit it can't be any less than Burd!
This company needs to be downsized to increase shareholder value, jettisoning all underperforming companies and cleaning up the bloated backstage help. Then, change the business model in the stores because cutting staffing levels every year isn't working. Remember, Steve Burd wanted to own the middle when he spent billions upgrading the stores and at the time, probably had 40% more labor than the stores have today!