Idol shows on Tuesday/Wednesday normally in the USA. Where are you watching from? Maybe your days are shifted. In any case, for the next three weeks it is on for three nights. Check your local listings for dates and times.
Hmm...I'm in China and am watching "Star World", which shows it on Wednesdays and Thursdays but states that it's "via satellite - watch it the same time America watches it," then 1 hour later again "prime-time". Hmm...false advertisement? Although, it would be strange since 6pm here would be like 5am there...or are you guys a day behind? I doubt that...