Toshiba Corp. announced Tuesday it returned to the black for the first time in four years as it booked a record net profit of ¥804 billion ($7.3 billion) for the 2017 business year, helped by debt sales of its now-bankrupt U.S. nuclear business.

The conglomerate also said it improved its balance sheet by recording ¥783.1 billion in shareholders' equity at the end of March, staving off a risk of being delisted from the Tokyo Stock Exchange.

The company reported a negative net worth of ¥553 billion at the end of March 2017.