Document and Entity Information
3 Months Ended
Jun. 29, 2014
Jul. 18, 2014
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 29, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Entity Registrant Name InvenSense Inc  
Entity Central Index Key 0001294924  
Current Fiscal Year End Date --03-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   88,875,980