The effective date of the Amendment to the Credit Agreement.

No definition available.

Name:	qnst_AmendmentDate
Namespace Prefix:	qnst_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- Definition

Line of credit facility annual fee amount.

+ References

No definition available.

+ Details

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

- Definition

Line of credit facility covenant compliance quick ratio.

+ References

No definition available.

+ Details

Name:	qnst_LineOfCreditFacilityCovenantComplianceQuickRatio
Namespace Prefix:	qnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility covenant minimum EBITDA.

+ References

No definition available.

+ Details

Name:	qnst_LineOfCreditFacilityCovenantMinimumEbitda
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum extraordinary or non-recurring cash expenses to be included in Adjusted EBITDA.

+ References

No definition available.

+ Details

Name:	qnst_MaximumAdjustedEarningBeforeInterestTaxDepreciationAndAmortizationExtraordinaryOrNonrecurringCashExpenses
Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ References

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qnst_FirstAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qnst_SecondAmendmentToCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qnst_ThirdAmendmentToCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail) - USD ($)		6 Months Ended
Debt - Additional Information (Detail) - USD ($)	Nov. 04, 2011	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Adjusted EBITDA		$ 5,000,000
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
Revolving loan facility [Member]
Debt Instrument [Line Items]
Loan facility, total	$ 25,000,000
Credit Agreement expiration date		Jun. 11, 2017
Annual facility fee	$ 62,500
Annual unused fee, percentage	0.25%
Minimum EBITDA			$ 5,000,000	$ 4,000,000	$ 3,000,000	$ 2,000,000	$ 1
Revolving loan facility, covenant terms		1. Minimum EBITDA as of the end of each fiscal quarter for the trailing twelve month period of not less than: (a) $1 for the quarter ended June 30, 2015; (b) $2,000,000 for the quarter ended September 30, 2015; (c) $3,000,000 for the quarter ended December 31, 2015; (d) $4,000,000 for the quarter ended March 31, 2016; and (e) $5,000,000 for the quarter ended June 30, 2016. Thereafter, minimum EBITDA increases each quarter in $1,000,000 increments; provided that there shall be no loss in EBITDA greater than $2,000,000 in any fiscal quarter during such trailing four quarter period. 2. Minimum adjusted quick ratio as of the end of each month of not less than 1.25 to 1.00.
Minimum adjusted quick ratio		125.00%
Outstanding amount		$ 0	$ 15,000,000
Revolving loan facility [Member] \| Eurodollar rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate	3.00%
Revolving loan facility [Member] \| First Amendment [Member]
Debt Instrument [Line Items]
Loan Amendment date		Feb. 15, 2013
Revolving loan facility [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Loan Amendment date		Jul. 17, 2014
Revolving loan facility [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Loan Amendment date		Jun. 11, 2015