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BS"D on documents for secular/non-Jewish audiences

Many Jews write BS"D or בס"ד (standing for בסיעתא דשמיא meaning "with God's help") or something similar at the top of all documents. As far as I am aware, there is no halacha that requires anything like this, but people do it as a way of acknowledging that everything that they do can only be done with God's help. Do people who follow this practice tend to write this on documents that are intended for non-Jews or secular Jews who would be unaware of the meaning and confused by the strange acronym at the top of the page? Does it matter if the document is intended to be very professional (such as a business letter or a report for a company)?

(P.S. This question is tagged poorly. Please retag if you have better tag ideas.)