I am pretty sure that as long as your AUS national driving licence conforms to the requirements of 1968 Convention (which it probably does) you legally do not need an IDP. The countries who signed the convention must recognize national driving licences without need for IDP.
In practice though, as others have said, is good to have. I don't think BiB can legally "do you" for not having IDP, but they can still give you a lot hassle.
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