Press release for investors, q4 2014:
" gross margin between 38.5 percent and 39.5 percent
that's gross margin.. not operating margin.
(wiki)
Gross margin is the difference between revenue and cost before accounting for certain other costs
http://www.investopedia.com/terms/o/operatingmargin.asp
Operating margin is a measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc