In addition, comparable e-commerce sales across all global markets for the four-week retail period were up 26%.
Total company same-store sales rose 6.2%, with a 6.0% increase in the United States.
Costco posted net sales of $12.17 billion for the five weeks ended July 2, 2017, up 5% from $11.33 billion during the year-ago period.
Burnett is being remembered for his work as a pharmacy pioneer who helped build and grow Costco’s pharmacy business.
Costco’s first monthly sales report since it beat Wall Street expectations with its Q3 results shows it continuing to right its ship after a difficult Q1 and Q2.
After missing Street estimates for earnings and revenue in its second quarter, Costco returned to form in its third quarter.
The Washington-based retailer reports net sales for the month reached $9.42 billion.
Payout of $7 per share will be made on May 26.