Mecanim - Detect End of state properly

So I need to know exactly when a state as ended to trigger another action.

So I have a state called "KickInHead" that transitions from Idle and once finished goes back to Idle.

 var kickInHeadState : int = Animator.StringToHash("Base Layer.KickInHead");
 var idleState : int = Animator.StringToHash("Base Layer.Idle");
 

It's all setup correctly and works fine. Then I start the animation with a trigger and define a character state that I can use to update him once the animation has completed:

 animController.anim.SetTrigger("isKickingHead");
 currentState = PlayerStates.BeatingUpActor;

Then, while the actor is in this new state I'm running this:

 if (animController.currentBaseState.nameHash != animController.kickInHeadState){
     currentState = PlayerStates.Idle;
 }

But what I noticed was that it immediately goes to 'PlayerStates.Idle, like the new state hasn't started yet. I assumed the issue would be the transition, that in theory its not yet on the new 'kickInHeadState' but actually transitioning which makes sense. So I added this:

 if (!animController.anim.IsInTransition(0) && animController.currentBaseState.nameHash != animController.kickInHeadState){
     currentState = PlayerStates.Idle;
 }

And it still doesn't work...he still believes I'm in Idle...so the only way I can do it is by writing and saying : leave this state IF back to Idle and Not in transition...

 if (!animController.anim.IsInTransition(0) && animController.currentBaseState.nameHash == animController.idleState){
     currentState = PlayerStates.Idle;
 }

And now it works fine...but it feels very messy to me, its like states are overlapping. I assumed that 'GetCurrentAnimatorStateInfo' would give you only ONE state but it seems like the state machine actually has overlapping states on the same layer?

Any help would be very appreciated!