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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Goodwill impairment charge $ 3.0 $ 3.0
U.S. RadioShack Company-Operated Stores [Member]
   
Goodwill before lower market capitalization $ 3.0 $ 3.0