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Restructuring Costs - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2017
Restructuring And Related Activities [Abstract]
Restructuring inception year and month	2016-11

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- Definition

Restructuring and related activities initiation month year.

+ References

No definition available.

+ Details

Name:	qnst_RestructuringAndRelatedActivitiesInitiationMonthYear
Namespace Prefix:	qnst_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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