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Special Charges (Details) (Special Charges [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
SMSC Acquisition [Member]
 
Unusual or Infrequent Item [Line Items]  
Severance related, office closing, and other costs $ 10.9
Silicon Storage Technology Inc Acquisition Member
 
Unusual or Infrequent Item [Line Items]  
Legal settlement costs $ 11.5