TBH that isn't really THAT expensive for a dealer. You could for sure do it cheaper yourself but...
Is the oils made from gold? How much do you normally pay for your oil? $77 for 5.2L of 5w30 oil (assuming it is quality stuff) is similar to what you would pay off the shelf at supercheap or similar.
$200 of that is trans oil which as @willisnz said is just expensive stuff. You could probably get this cheaper elsewhere but it is annoying to change in an auto IMO.
Another $120 is gst.
Labour is expensive at a garage because that's what it takes to run a business with overheads and qualified staff.
In that breakdown they are also changing every serviceable fluid/filter. Whether that is actually necessary is up to you.
I'm not saying $918 dollars isn't a lot of money, but if you look at the breakdown they really aren't ripping you off. If I were you I'd do the service myself however.
Edit: The cabin filter is pretty overpriced, but everyone seems to do that for some reason. If you look at cost vs retail for somewhere like ripco. Cost is usually $20-30 on a cabin filter and they put rrp at $70-90. Not sure why the industry standard for cabin filter price is so high when they really aren't expensive to manufacture.