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Billie Joe Armstrong makes his Broadway debut as 'St. Jimmy' in 'American Idiot' at the St. James Theater in NYC on Sept. 28.

Having Billie Joe Armstrong on Broadway was -- not surprisingly -- a pretty smart move for "American Idiot."

Producers of the rock musical say ticket sales soared to more than $1 million last week when the Green Day front man joined the show for eight performances ending Sunday.

Video: Green Day's Billie Joe Armstrong Makes

'American Idiot' Debut on Broadway

The show's weekly average gross has been $740,000 since it opened on April 20 at the St. James Theatre. Last week it was $1,092,334.

Armstrong, who composed and co-wrote the musical, made his Broadway debut as "St. Jimmy." Actor Tony Vincent will resume performances in the role on Oct. 12, with understudies playing the part until then.

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