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v3.19.1

Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2018
Commitments And Contingencies [Line Items] |  |  |  |  |
Rent expense for office space | $ 900,000 | $ 800,000 | $ 2,900,000 | $ 2,400,000 |
Leases expiration year |  |  | 2026 |  |
Estimated fair value of indemnification agreements | 0 |  | $ 0 |  | $ 0
Estimated fair value of indemnity provisions | 0 |  | 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 |  | 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 |  | $ 500,000 |  |
Letters of credit automatically renew annually without amendment on the annual expiration date |  |  | 30 days |  |
Unsecured Revolving Promissory Note [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Promissory note, principal amount |  | $ 2,500,000 |  | $ 2,500,000 |
Promissory note, accrued interest rate percentage |  | 6.00% |  |  |
Promissory note, frequency of periodic interest receipts |  |  | Monthly |  |
Promissory note, outstanding principal balance | $ 0 |  | $ 0 |  |
Promissory note, expiration date |  |  | Jan. 01, 2019 |  |

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 Commitments and contingencies. + References No definition available. + Details
Name: | qnst_CommitmentsAndContingenciesLineItems
Namespace Prefix: | qnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Frequency of periodic interest receipts. + References No definition available. + Details
Name: | qnst_FrequencyOfPeriodicInterestReceipts
Namespace Prefix: | qnst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 Maxmium amount of promissory note principal balance. + References No definition available. + Details
Name: | qnst_MaximumPromissoryNoteAmount
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Final fiscal year of operating lease under current arrangement. + References No definition available. + Details
Name: | qnst_OperatingLeaseExpirationYearEnd
Namespace Prefix: | qnst_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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
- Definition Promissory note expiration date. + References No definition available. + Details
Name: | qnst_PromissoryNoteExpirationDate
Namespace Prefix: | qnst_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The interest rate for promissory notes that have an interest rate. + References No definition available. + Details
Name: | qnst_PromissoryNoteInterestRate
Namespace Prefix: | qnst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition For promissory notes which are quantified by principal amounts, the principal balance held at close of period. + References No definition available. + Details
Name: | qnst_PromissoryNotePrincipalAmount
Namespace Prefix: | qnst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |