Costco delivered another rock-solid earnings report.Costco Wholesale (COST -2.92%) is one of the most dominant retailers in the world, and it continues to outpace its brick-and-mortar peers, quarter in and quarter out.Costco keeps opening stores around the world, differentiating itself from other retail giants like Walmart and Home Depot, and it's seeing strong growth in e-commerce, showing that there's plenty of untapped demand for the buy-in-bulk, big-box chain.Those trends were on display in Costco's fis ...