Lululemon shares dive on risks of prolonged overhaul under new CEO

Lululemon shares plunged about 20% after the athleisure company cut its full-year forecast for the second time. Investors are weighing a potentially lengthy turnaround under incoming CEO Heidi O'Neill as the company struggles with weaker sales, shrinking margins, promotions and rising competition from brands including Alo Yoga and Skims.