Ratings: American Idol Dips But Boosts Glee Finale; Biggest Loser Closer Eats All-Time Low

American Idol‘s final performance show took a dip in the coveted 18-49 demo this year, scoring a 6.2 rating while drawing in 20 million total viewers. Compared to Season 9’s final sing-off, the demo was down 7 percent, while versus last Wednesday’s Top 3 performance show, the rating dropped 16 percent.

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In total viewership, last night’s Idol outing amassed a few hundred more folks than last year’s performance finale.

Nonetheless benefiting from the robust lead-in was Glee, which saw a 38 percent week-to-week boost in audience (to 12.1 million viewers) and a 31 percent bump in the demo (to a 4.6). That said, Glee‘s rating was down slightly from its year-ago outing (which also led out of an Idol finale), while its total audience was up 11 percent versus its Season 1 finale, which aired in June.

Elsewhere on this final Tuesday night of May sweeps:

* Dancing With the Stars crowned its latest champion in front of 21 million total viewers, while scoring a 4.5 demo rating — up 15 and 18 percent, respectively, from last spring’s finale.

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* The Biggest Loser, with 8.1 million viewers and a 3.1 rating, dropped some 20 percent to a series all-time low for a season-ender.

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* In its fifth week and opposite the DWTS coronoation, NBC’s The Voice delivered 8.55 million viewers and a 3.8 rating, dropping 13 and 16 percent.