I'm not an expert in this by any means but...
Listing a purchased asset as having goodwill value isn't uncommon. In fact, with buyouts, it is very, very much the norm. The idea that you valued a company more than its total assets and liabilities is one of the basic tenants of buyouts; that you valued their "brand" more than their real worth. It's why- for example- Amazon paid 25% more for Whole Food's shares than what they closed at the previous day. In fact, when my company bought out another one last year and had to report a bargain purchase (essentially the opposite of goodwill) on it, there were a lot of questions about why on our financial call that quarter. Getting a deal can scare investors. Investing in a name- and overpaying- isn't necessarily a bad thing. That's a point that
this missed. While I agree that AbInBev, Constellation, etc. are buying up these breweries for reasons other than wanting to offer "craft" beers, I think it's a stretch to think there's that much more to it than those companies wanting much more than shelf space that they've been losing.
All that said, I have no idea what an 8.7% impairment charge is compared to what's "normal." It could very well be that they did grossly overpay, but the fact that they listed this in itself is not a crazy thing.