ROCHESTER, N.Y.--(BUSINESS WIRE)--Paychex, Inc. ("Paychex," "we," "our," or "us") (NASDAQ:PAYX) today announced its results of operations for the three months ended May 31, 2015 (the "fourth quarter"), as well as the full year ended May 31, 2015 ("fiscal 2015" or the "fiscal year"). Total service revenue increased 8% to $681.4 million for the fourth quarter and 9% to $2.7 billion for the fiscal year, compared to the respective periods last year. Net income and diluted earnings per share each in