Document and Entity Information
9 Months Ended
Mar. 31, 2012
Apr. 30, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name QUINSTREET, INC  
Entity Central Index Key 0001117297  
Document Type 10-Q  
Document Period End Date Mar. 31, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   44,170,857