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Leases - Additional Information (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Lease Cost [Abstract]
Lessee, operating lease, renewal term	5 years
Future principal contractual obligations for operating lease commitments undiscounted lease liability excess amount	$ 0.2

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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 https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant