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Document and Entity Information - shares
 3 Months Ended
Sep. 30, 2024
Nov. 04, 2024
Cover [Abstract]    
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description QuinStreet, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-Q/A (this “Amendment”) to its Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2024, which was originally filed with the Securities and Exchange Commission (the “SEC”) on November 8, 2025 (the “Original Filing”). This Amendment is being filed to revise Part II “Item 5. Other Information” by adding a Rule 10b5-1 trading arrangement entered into by Douglas Valenti, our Chief Executive Officer on behalf of the Valenti Living Trust, during the quarter ended September 30, 2024, which was inadvertently omitted from the disclosure included in the Original Filing.In addition, as required by Rule 12b-15 of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by the Company’s Chief Executive Officer and Chief Financial Officer are filed herewith as exhibits to this Amendment, under Item 6 hereof, pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. The Company is also not including new certifications under Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) (Section 906 of the Sarbanes-Oxley Act of 2002), as no financial statements are being filed with this Amendment.Other than as expressly set forth herein, this Amendment does not, and does not purport to, amend, update or restate the information in Original Filing or reflect any events that have occurred after the Original Filing was made. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time as of which the Original Filing was made. No changes have been made to the financial statements of the Company as contained in the Original Filing. Accordingly, this Amendment should be read together with the Original Filing and the Company’s other filings with the SEC.  
Document Period End Date Sep. 30, 2024  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Trading Symbol QNST  
Entity Registrant Name QuinStreet, Inc.  
Entity Central Index Key 0001117297  
Current Fiscal Year End Date --06-30  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity File Number 001-34628  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   56,262,970
Entity Tax Identification Number 77-0512121  
Entity Address, Address Line One 950 Tower Lane  
Entity Address, Address Line Two 12th Floor  
Entity Address, City or Town Foster City  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94404  
City Area Code 650  
Local Phone Number 578-7700  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock, par value $0.001 per share