CACI International has made a $7.2 billion cash-and-stock offer to acquire CSRA Inc. in a bid to break up the government IT services company’s blockbuster sale to General Dynamics Corp., the Wall Street Journal reported Sunday. The offer of about $44 per share would top General Dynamics’ winning bid of $40.75 per share, according to the report, attributed to an unnamed source. Falls Church-based CSRA (NYSE: CSRA) agreed to the offer to Feb.