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Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
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 fidelity bonds placed with an insurance company	400,000
Letter of credit agreement with a financial institution that is used as collateral for the Company's corporate headquarters' operating lease	$ 500,000
Letters of credit automatically renew 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

The amount of the letter of credit used as collateral for the corporate headquarter operating lease.

+ References

No definition available.

+ Details

Name:	qnst_LettersOfCreditForOperatingLease
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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration