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Leases - Additional Information (Detail) $ in Millions | Mar. 31, 2022 USD ($)
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Lease Cost [Abstract] |
Lessee, operating lease, renewal term | 5 years
Future principal contractual obligations for operating lease commitments undiscounted lease liability excess amount | $ 0.3

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- Definition Future principal contractual obligations for operating lease commitments undiscounted lease liability excess amount. + References No definition available. + Details
Name: | qnst_FuturePrincipalContractualObligationsForOperatingLeaseCommitmentsUndiscountedLeaseLiabilityExcessAmount
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant