Sam's Club sales soar as membership swells to an all-time high - and Walmart's CEO says he hasn't seen this kind of growth in 19 years

• Sam's Club announced soaring results in Walmart's latest quarterly earnings call.
• The warehouse chain has hit an all-time high for member count.
• Sam's Club also saw a comparative sales jump of 7.7%.

Sam's Club has posted a soaring quarter thanks to a boom in e-commerce sales, spiking comparative sales, and an all-time high in overall memberships. The company's top executives, including Walmart CEO Doug McMillon, discussed the latest results in the company's earnings call Tuesday.

The warehouse chain's comparative sales grew 7.7%. Minus tobacco and fuel, that comparative sales figure jumps to about 10%. Sam's Club's ecommerce sales spiked 27%, and membership income grew 12.2%. Executives said that overall member count had hit a "record high," while renewal rates are up as well.

McMillon said that Sam's Club has seen four consecutive quarters of "double digit growth." The Walmart CEO, who previously served as the Sam's Club CEO from 2005 to 2010, also touted the segment's growth.

"Sam's Club in the US continues to impress," McMillon said. "19 years ago, I got the opportunity to become the chief merchant at Sam's. And I can confirm there hasn't been a time in at least 19 years when Sam's has had this much momentum."

He said that Walmart has completed its rollout of Scan and Go technology at all Sam's Club, and said that membership rates for Walmart Plus members also also on the rise.

"Sam's is an innovation engine for the company, and they're showing us all what's possible with technology products like Scan and Go," he said.

In response to a question from the analysts, Sam's Club CEO Kathryn McLay broke down some of the driving factors behind the chain's recent growth.

"Our strength is coming through grocery," she said. ""We're really proud to see the home and apparel business growing at the rate that it's growing over the last two quarters as well. There's a real strength coming through across the box."