Under Armour is laying off workers as retailer says North America sales will plunge this year

Under Armour announced a broad restructuring plan on Thursday as it said sales in its largest market, North America, plunged 10% and predicted the trend will get worse throughout its current fiscal year. 

The athletic apparel retailer also saw profits sink by more than 96% during its fiscal fourth quarter, compared with the year-ago period. 

It's unclear how many employees Under Armour will lay off as part of therestructuring, but the plan is expected to cost between $70 million and $90 million, a portion of which will be used for employee severance and benefits costs. The company declined to share more information with CNBC about its restructuring.

The company's shares initially plunged double digits in pre-market trading after its earnings report was released, but later rebounded after its earnings call with Wall Street analysts.Shares were more than 2% higher in morning trading.

Here's how the athletic apparel retailer did in its fiscal fourth quarter compared with what Wall Street was anticipating, based on a survey of analysts by LSEG:

The company's reported net income for the three-month period that ended March 31 was $6.6 million, or 2 cents per share, compared with $170.6 million, or 38 cents per share, a year earlier. Excluding one-time items, the company reported earnings of 11 cents per share. 

Sales dropped to $1.33 billion, down about 5% from $1.4 billion a year earlier. 

During the quarter, sales in North America declined 10% to $772 million, worse than the $780 million that analysts had expected, according to StreetAccount. 

Under Armour said it expects sales to continue to worsen in North America. The company anticipates they will drop between 15% and 17% in its current fiscal year. 

"Due to a confluence of