Closing the News of the World cost Rupert Murdoch's News Corp $91m (£57.2m), the company has announced.

The tabloid, the most profitable newspaper in Murdoch's portfolio, was shut in July amid an escalating investigation into illegal phone hacking at the company that has cast doubt on the 80-year-old Murdoch's succession plans. The scandal has triggered investigations into the company on both sides of the Atlantic, the resignation of senior executives and more than a dozen arrests.

Last month, independent shareholders overwhelmingly voted to have James Murdoch, deputy chief operating officer and head of the division that oversaw the UK title, and his brother Lachlan booted off the board.

Announcing the latest quarterly earnings, Chase Carey, News Corp's chief operating officer, said: "We have great confidence in James. James has done a good job. We are not contemplating any changes." He said he took the views of shareholders seriously but was "proud" of News Corp's board and the work it had done.

Murdoch, chairman and chief executive of the company, was not on the call with press and analysts.

Carey said he could not comment on the ongoing investigations of News Corp. He said the issues would be properly addressed and that the company was fully co-operating with the UK authorities. "I really want to assure you that despite the time spent on the UK issues, the last three months have been a time of real progress, driving the business toward both our short- and long-term goals," he said.

News Corp also incurred $130m in "other" charges over the quarter, which included the cost of dropping its bid to acquire 100% of satellite broadcaster British Sky Broadcasting.

The company reported total revenue for the first quarter of $7.96bn, 7% higher than a year ago. Net income was down by nearly 5% to $738m thanks in part to the News of the World closure and fees the company incurred after it was forced to withdraw its full takeover bid for BSkyB.

News Corp's cable network group, which includes the FX network and Fox News, performed well, producing operating income of $775m for the quarter, up 18% from a year earlier, as advertising revenue picked up and the firm increased fees for the rights to distribute shows including American Idol, the Emmy Awards and The X Factor.

The company's film group reported a 24% increase in operating income for the quarter to $347m, powered by Rise of the Planet of the Apes, which grossed more than $450m at the box office and home entertainment sales of the animated release "Rio" and "X-Men: First Class.

Carey confirmed that Fox has commissioned a second series of Simon Cowell's The X Factor for US television.