Why would there be a $20 downturn? Call me stupid or what not, but such strong numbers should be indicative of strong sales and henceforth would make it obvious to buy more Stock.
You can pretty well predict this, and join the fun if you want, but its a gamble.
AAPL generally rises as earnings report approaches (as it did last week), then tanks from the after-hours traders trying to sell at the 'high'. That drives prices down in the after-hours market, but doesn't necessarily tell you what it will open at tomorrow, which is the real number to watch.
If you have guts, you can make a tidy sum by selling the day before earnings and buying back in a few weeks later. But you can also get sideswiped just as easily. Not a game for the feint hearted.
Bottom line is that it doesn't mean anything for those holding long.