^just a financial thing...you are comparing apples to oranges here. In general, their operation is healthy as long as the profit covers interest payments. In other words, you should compare the interest payment with profit instead of comparing total debt amount with the profit.
Another indicator is financial leverage. In that case you should compare their debt amount to the sum of the equity+debt to figure out the leverage ratio. It's not a good thing to over leverage, i.e., borrowing too much debt. When the business wants to grow, the CEO will look at internal profit for money first, then debt, and to balance the capital resources, IPO will be used to raise cash as well. Prada is doing that right now to gain more financial resources and expand their business.