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Acquisition (Narrative) (Details) - USD ($)
 3 Months Ended
Aug. 05, 2016
Aug. 04, 2016
Jan. 25, 2016
Dec. 31, 2016
Mar. 31, 2016
Sep. 30, 2016
Smart Card Software Limited            
Business Acquisition [Line Items]            
Total consideration     $ 92,600,000   $ 104,700,000  
Escrow deposit for indemnification obligations and other contractual provisions     $ 17,100,000      
Escrow deposit release term     18 months      
Business acquisition transaction costs           $ 2,000,000
Smart Card Software Limited | Scenario, Previously Reported [Member]            
Business Acquisition [Line Items]            
Total consideration         12,100,000  
Cash consideration         11,600,000  
Working capital consideration         4,000,000  
Liabilities assumed         $ 3,500,000  
Smart Card Software Limited | Scenario, Forecast            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ 10,800,000    
Inphi Memory Interconnect Business [Member]            
Business Acquisition [Line Items]            
Total consideration   $ 90,000,000        
Escrow deposit for indemnification obligations and other contractual provisions   $ 11,300,000        
Escrow deposit release term   12 months        
Business acquisition transaction costs           600,000
Snowbush [Member]            
Business Acquisition [Line Items]            
Total consideration $ 32,000,000          
Business acquisition transaction costs           600,000
Business Combination, Contingent Consideration, Liability           6,800,000.0
Maximum [Member] | Snowbush [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration, Liability           $ 50,000,000.0