Is it though? I fear that all this will do is allow WalMart to clobber them individually then take over their market share. A&K combined are already smaller than Wally World. (13% vs 22%). It would actually be more helpful to the grocery market if they forced Walmart to divest, what their doing with this is likely to end up with Walmart taking it all.
The FTC has always been harsher about monopolization via mergers versus business finding success independently. Not saying that's the right way to handle things, but Walmart got to where they are through competing, not merging, with other businesses.