Only able to share you Google Apps calendar with the permission "See only free / busy (hide details)"?

I've recently moved from my all in one Outlook setup to separate Google Apps for your domain instances which I'm really loving, but one thing that was bugging me was not being able to see my calendar from my other domains. I was able to share the calendar fine, but it was only giving me the option to share it with the permission "See only free / busy (hide details)", so I could see when I had things scheduled in my other calendar's but not what they were.

After a bit of mucking around I found the Sharing Options setting in the Manage This Domain > Service Settings > Calendar Settings page that allows you to specify the highest level of sharing that you want to allow for the users of your domain. If you don't have access to manage your domain, talk to your domain administrator and they should be able to sort it out.