Document and Entity Information - shares
6 Months Ended
Dec. 31, 2015
Jan. 27, 2016
Document and Entity Information    
Entity Registrant Name OSI SYSTEMS INC  
Entity Central Index Key 0001039065  
Document Type 10-Q  
Document Period End Date Dec. 31, 2015  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   19,790,211
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2