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Divestitures - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2020 | Apr. 30, 2020 | Feb. 14, 2020 | Sep. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Purchase price of asset sell | $ 20.0 | $ 3.3 |  |  |  |
Purchase price of agreement |  |  | $ 12.9 |  |  |
Proceeds from sale of business |  |  | 10.0 |  |  |
QuinStreet Brasil Online Marketing e Midia Ltda ("QSB") and VEMM, LLC ("VEMM") [Member] | Euro-Demand Do Brasil Servios de Gerao de Leads Ltda (EDB) [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | $ 1.1
Secured Promissory Note [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Secured promissory note, receivable |  |  | $ 2.9 |  |  |
Other Income (Expense) [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Gain (loss) on disposition of operation |  |  |  | $ 16.6 | $ 2.8 | $ 12.0

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