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v3.26.1

Revenues - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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May 02, 2026 | May 03, 2025
Revenue from Contract with Customer [Abstract] |  |
Remaining performance obligation | $ 0.4 |
Revenue recognized related to gift card redemptions and breakage | $ 3.3 | $ 3.2

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- Definition Contract with customer liability revenue recognized including gift card redemptions and breakage. + References No definition available. + Details
Name: | jill_ContractWithCustomerLiabilityRevenueRecognizedIncludingGiftCardRedemptionsAndBreakage
Namespace Prefix: | jill_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant