Jan 22 (Reuters) - Plexus Corp. Q1 net income USD 37.267 million. * Q1 revenue USD 976.122 million vs. IBES estimate USD 982.2 million * Q1 operating margin 4.8% * Q1 gross profit USD 100.692 million * Q1 operating income USD 46.86 million * outlook Q2 EPS USD 1.22-1.37 * outlook Q2 revenue USD 960-1,000 million * outlook Q2 operating margin 4.6-5%