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Prepaid Expenses and Other Assets - Additional Information (Detail) - Partnership Agreement [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Jun. 30, 2016 | Jun. 30, 2020
Prepaid expenses and other assets [Line Items] |  |  |  |
Partnership agreement |  |  | 10 years |
Upfront cash payment |  |  | $ 10.0 |
Prepaid expenses and other assets |  |  |  | $ 5.3
Amortization expense | $ 0.2 | $ 0.8 |  |

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 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 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 Prepaid expenses and other assets. + References No definition available. + Details
Name: | qnst_PrepaidExpensesAndOtherAssetsLineItems
Namespace Prefix: | qnst_
Data Type: | xbrli:stringItemType
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
- Details
Name: | us-gaap_TypeOfArrangementAxis=qnst_PartnershipAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |