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Legal Proceedings (Details)
12 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Apr. 02, 2011
USD ($)
Mar. 30, 2013
USD ($)
Nov. 29, 2012
All Ring Patent Infringement Prosecution
USD ($)
Nov. 29, 2012
All Ring Patent Infringement Prosecution
TWD
Mar. 31, 2012
All Ring Patent Infringement Prosecution
USD ($)
LOC
Gain Contingencies            
Number of Letter of Credit Facilities           3
Settlement received       $ 16,300,000 475,000,000  
Letters of credit, amount 19,500,000         19,500,000
Restricted cash 22,269,000   0      
Legal settlement costs $ 600,000 $ 1,400,000