He played senior hockey for the Cornwall Flyers and the Hull Volants from 1936 to 1939 and then two seasons with the Springfield Indians from 1939 to 1941. After that he returned to the Cornwall Flyers (1941-42) and the Cornwall Army in 1942-43. Thibeault played 4 games with the Detroit Red Wings (scoring two assists) in the 1944-45 season and one scoreless game with the Montreal Canadiens in 1945-46. He spent most of the years 1943 to 1946 in the American Hockey League. He played with a number of senior and minor pro teams until his retirement in 1956.