He was made Raja Di Hilir in 1933, succeeding Raja Chulan, who died that year. He was appointed Raja Bendahara in October 1938 upon the demise of his father. Ten years later, on 29 March 1948, the then sultan, Sultan Abdul Aziz, died and Raja Idris was made Raja Muda (Crown Prince) by his cousin, the new sultan, Sultan Yussuf Izzuddin Shah.[1]