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Commitments and Contingencies - Legal Proceedings - Narrative (Details) - Pending Litigation [Member] - lawsuit_filed
May. 02, 2012
Apr. 02, 2012
Feb. 29, 2012
Feb. 24, 2012
Feb. 13, 2012
Feb. 09, 2012
Jan. 27, 2012
Jan. 13, 2012
Nov. 23, 2011
United States District Court for the Northern District of California [Member]                  
Loss Contingencies [Line Items]                  
Shareholder suits   1 1 1 1   1 1  
Superior Court of California, Santa Clara County [Member]                  
Loss Contingencies [Line Items]                  
Shareholder suits 1         1     1