The deal was formally announced on Wednesday morning.
Young was designated for assignment Monday to make room on the 40-man roster for infielder Juan Castro, who was promoted from Triple-A Albuquerque to replace Blake DeWitt, who was optioned to Albuquerque.
The outfielder had been on the disabled list, still recovering from offseason elbow surgery. He was serving an injury-rehabilitation assignment at Albuquerque.
Young, 26, was a fourth-round Draft pick in 2002. Except for an injury-rehab stint at Triple-A, Young spent all of 2008 on the Major League club, primarily as a pinch-hitter, batting .246 in 83 games.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.