So You Think You Can Dance was in that Q1 slot in 2008-2010, Started with the Audtions/Top 100 to Top 20 cull in early Feb, then the Lives went from about mid-Feb to mid-late April.
Remember in fact our very First season of Idol back in 2003 had a semi-protracted Finals portion too, becuase the Semi Finals were done weekly that year and there was 5 plus the wildcards, we didn't get to the final 12 until late September, so They did Double eliminations for 3 weeks until the Final 6.
It's also going to be different having the finale not be close to Christmas and kindof capping off the year with the Opera House Finale (if its going to happen again) and potential hit single (as mentioned before though the question is can the show reinvigoate somehwere close to that level of hype around it again like the glory days who knows).
X Factor Australia was kinda like that here in the Channel Seven Days and X Factor UK had that kindof format at the end of the year too. Channel Seven's Popstars Live (2004) and X Factor on Channel Ten (2005) were also first half of the year launches, but both also had some behind the scenes dramas iirc. American Idol also moved to that time from the second season too, but they strethed it out till May in their ratings calendar. Lets see how Aus Idol does in this space.