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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 9 Months Ended |
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Mar. 31, 2026 | Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract] |  |
Estimated fair value of indemnification agreements | $ 0 | $ 0
Estimated fair value of indemnity provisions | 0 | $ 0
Letter of credit agreement with a financial institution that is used as collateral for the Company's corporate headquarters' operating lease | $ 300,000 |
Letter of credit automatically renews annually without amendment on the annual expiration date | 30 days |

X
- Definition An agreement (contract) that contingently requires the guarantor to make payments to the guaranteed party in compensation for that party's or parties' loss or injury attributable to specified events or actions, such as a patent infringement action against an entity that relied on certain representations as to ownership rights made by the Company. + References No definition available. + Details
Name: | qnst_AccrualForIndemnificationProvisions
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the letter of credit used as collateral for the fidelity bonds. + References No definition available. + Details
Name: | qnst_LettersOfCreditForFidelityBonds
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition An agreement (contract) that contingently requires the guarantor to make payments to the guaranteed party in compensation for certain events or occurrences while that officer or director's serves in such a capacity. + References No definition available. + Details
Name: | qnst_LiabilitiesRelatedToIndemnificationAgreement
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period in which the letters of credit automatically renew from annual expiration date. + References No definition available. + Details
Name: | qnst_PeriodOfCancellationOfLetterOfCreditFromAnnualExpirationDate
Namespace Prefix: | qnst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration