By and large, when a company is good at something, investors are right to be wary when that company ventures away from its core and into new businesses. In the case of Commercial Metals Company ( CMC ), though, the company’sAnalyst’s Disclosure:I/we have no stock, option or similar derivative position in any of the companies mentioned, and no plans to initiate any such positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it (o ...