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Balance Sheet Components - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Balance Sheet Components [Line Items]
Depreciation expense	$ 2.3	$ 3.8	$ 4.0
Amortization expense related to internal software development costs	2.9	$ 2.4	$ 2.4
Partnership Agreement [Member]
Balance Sheet Components [Line Items]
Partnership agreement		10 years
Upfront cash payment		$ 10.0
Prepaid expenses and other assets	1.0	1.0
Other assets, noncurrent	7.3	8.3
Amortization expense	$ 1.0	$ 0.7

X

- Definition

Amortization of internal software development costs.

+ References

No definition available.

+ Details

Name:	qnst_AmortizationOfInternalSoftwareDevelopmentCosts
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate expense charged against earnings to allocate the cost of the upfront cash payment in a systematic and rational manner to the periods expected to benefit from such payment.

+ References

No definition available.

+ Details

Name:	qnst_AmortizationOfUpfrontCashPayment
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Balance sheet components.

+ References

No definition available.

+ Details

Name:	qnst_BalanceSheetComponentsLineItems
Namespace Prefix:	qnst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of the upfront cash payment that provide an economic benefit in future periods that is expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	qnst_CurrentPortionOfUpfrontCashPayment
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of the upfront cash payment that provide an economic benefit in future periods that is expected to be realized or consumed after one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	qnst_NonCurrentPortionOfUpfrontCashPayment
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Partnership agreement term.

+ References

No definition available.

+ Details

Name:	qnst_PartnershipAgreementTerm
Namespace Prefix:	qnst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Upfront cash payment.

+ References

No definition available.

+ Details

Name:	qnst_UpfrontCashPayment
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=qnst_PartnershipAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: