American Idol steamrolled its way to the top during a week of season finales, helping boost CTV, which made away with the most eyeballs among the recent wrap-ups of U.S. series.

The seventh season of Idol ended Wednesday with 3.1 million viewers tuning in to see rocker David Cook win bragging rights and a recording contract. It marks an 18% increase over last year’s finale, and peaked at 3.8 million. CTV says the Fox show was its fourth most-watched broadcast of the year, following the Super Bowl, the Academy Awards and an episode of CSI. (All numbers 2+.)

Meanwhile, the season ender of CSI: Miami on May 19 nabbed 2.1 million viewers and spoiled the premiere of the critically acclaimed Canuck series Durham County on Global at 10 p.m. The crime drama, a copro by Muse Entertainment and Back Alley Films, aired to 551,000 viewers, despite a strong lead-in from House, which wrapped its fourth season with 2.6 million viewers. A Global spokesperson points out that it’s the second outing for Durham, which previously aired on pay-TV channels The Movie Network and Movie Central.

Still with Global, the finale of Bones on Monday at 8 p.m. scored its highest audience of the season with 1.8 million viewers, half of them in the key 18-49 demographic. NCIS drew 1.4 million the following night for its two-hour ep, though it faced stiff competition from Idol‘s second-to-last performance episode, which earned three million.

Back on CTV, the net also saw strong numbers for the season enders of Dancing with the Stars (two million), CSI: NY (two million) and Grey’s Anatomy — with 2.6 million viewers tuning in Thursday for its season finale. That’s up from the 1.8 million that watched last year’s season ender of the medical drama.

The network says Grey’s is Canada’s most-watched series, noting that it beat out medical rival House, on Global, from Sept. 24 to May 22. Grey’s had an average 2.4 million viewers versus 2.1 million for House.