Is irony and idioms the same?

Nope. Idioms are like sayings "exaggeration saying" but you dont really mean them. Like for example, "break a leg" is an idiom, but it doesnt truly mean break a leg,it means "good luck". Irony is something happens that nobody expected it. Like for example, a billionaire winning a lottery is an irony, because firstly, why would he win a lottery when he is already a billionaire, and second, why would he even enter the lottery in the first place when he already IS a billionaire?