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Document And Entity Information
Oct. 28, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 28, 2020
Entity File Number 001-34628
Entity Registrant Name QUINSTREET, INC.
Entity Central Index Key 0001117297
Entity Tax Identification Number 77-0512121
Entity Incorporation State Country Code DE
Entity Address Address Line1 950 Tower Lane
Entity Address, Address Line Two 6th 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol QNST
Security Exchange Name NASDAQ