The effective date of the Amendment to the Credit Agreement.

No definition available.

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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

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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 extended expiration date.

+ References

No definition available.

+ Details

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

- Definition

Percentage of amortization for year five of the principal of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnst_
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- Definition

Percentage of amortization for year four of the principal of credit facility.

+ References

No definition available.

+ Details

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- Definition

Percentage of amortization for year one of the principal of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnst_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Percentage of amortization for year three of the principal of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of amortization for year two of the principal of credit facility.

+ References

No definition available.

+ Details

Name:	qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearTwo
Namespace Prefix:	qnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period in which the letters of credit automatically renew from annual expiration date.

+ References

No definition available.

+ Details

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

- Definition

Upfront arrangement fees incurred in connection with the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

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

+ References

+ Details

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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

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

- Definition

The loss recognized on termination of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 275
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84167019&loc=d3e54681-109401

+ Details

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Balance Type:	debit
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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Balance Type:	debit
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- Details

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- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
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Balance Type:
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- Details

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- Details

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Debt - Additional Information (Detail) - USD ($)				1 Months Ended		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Jun. 11, 2015	Jul. 17, 2014	Feb. 15, 2013	Jun. 30, 2015	Nov. 30, 2011	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
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
Interest rate swap [Member] \| Other (expense) income, net [Member]
Debt Instrument [Line Items]
Expense recognized upon termination of agreement				$ 300,000
Term loan facility [Member]
Debt Instrument [Line Items]
Loan facility, total					$ 100,000,000
Percentage of amortization with principal of term loan facility year one					5.00%
Percentage of amortization with principal of term loan facility year two					10.00%
Percentage of amortization with principal of term loan facility year three					15.00%
Percentage of amortization with principal of term loan facility year four					20.00%
Percentage of amortization with principal of term loan facility year five					50.00%
Loan facility, term					5 years
Term loan facility [Member] \| Second Amended Agreement [Member] \| Base rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate		1.75%
Term loan facility [Member] \| Second Amended Agreement [Member] \| Eurodollar rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate		2.75%
Revolving loan facility [Member]
Debt Instrument [Line Items]
Loan facility, total					$ 200,000,000
Loan facility, term					5 years
Credit Agreement expiration date						Jun. 11, 2017
Outstanding amount						$ 0	$ 15,000,000
Revolving loan facility [Member] \| First Amendment [Member]
Debt Instrument [Line Items]
Loan facility, total			$ 200,000,000
Loan Amendment date						Feb. 15, 2013
Loan facility, current			100,000,000
Upfront arrangement fees incurred in connection with the term loan facility			200,000
Acceleration of unamortized deferred upfront costs			$ 700,000
Revolving loan facility [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Loan facility, total		$ 100,000,000
Loan Amendment date						Jul. 17, 2014
Loan facility, current		50,000,000
Acceleration of unamortized deferred upfront costs		300,000
Upfront arrangement fees incurred		$ 300,000
Revolving loan facility [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Loan facility, total	$ 50,000,000
Loan Amendment date						Jun. 11, 2015
Loan facility, current	25,000,000
Acceleration of unamortized deferred upfront costs	$ 500,000
Credit Agreement expiration date						Nov. 04, 2016
Credit Agreement extended expiration date						Jun. 11, 2017
Revolving loan facility [Member] \| Third Amendment [Member] \| Eurodollar rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate	3.00%
Revolving loan facility [Member] \| Second Amended Agreement [Member] \| Base rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate		1.375%
Revolving loan facility [Member] \| Second Amended Agreement [Member] \| Eurodollar rate plus [Member]
Debt Instrument [Line Items]
Applicable margin on borrowings rate		2.375%