You can check the status of your transaction by entering your txid in etherscan. Note that an Erc20 wallet is an Eth wallet and it would not be a problem if Idax helps you out with this. Post your txid or address of your exchange wallet here and let me see if I can help you out with this.
IDAX dont give out Keystore files / JSON so and using their support is impossible as they dont understand english
Exchanges never give out the private key details to customers, and you don't have a choice but to contact their support team.
My question is Do these funds automatically bounce back to my Orginal eth account or do they automatically move into the ETH account on their exchange?
No they won't bounce back as you say. You have no choice but to contact the support and they will restore your eth to your wallet. Most of the people had similar problem of messing up with addresses. Some have sent eth to an erc20 address and contacted the support and the support helped them in restoring the funds.