0001692115 2021-08-27 2021-08-27 false 0001692115 8-K 2021-08-27 SOUTHWEST GAS HOLDINGS, INC. DE 001-37976 81-3881866 8360 S. Durango Dr. Post Office Box 98510 Las Vegas NV 89193-8510 (702) 876-7237 false false false false Southwest Gas Holdings, Inc. Common Stock, $1 par value SWX NYSE false