Police Check in Australia -- Please advise?

i am about to do aged care myself and was told that with the police check all arrest will show up but it depends on what you did as you were a shoplifter which means a thief it is likely to affect your employment as you will be working with the elderly who are very vulnerable and trusting so they have to be able to trust you not to steal from them while you are working there but all you can do is be honest and let them know Straight away because if you don't when it comes back in the police report you will look more trustworthy if you tell them