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Commitments and Contingencies - Minimum Rent Payments and Contingent Rent Expense under Lease Agreements Accounted for Operating Leases as Build-To-Suit Lease Transactions (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Commitments And Contingencies Disclosure [Abstract] |  |  |
Minimum rent payments recognized as interest expense | $ 20.3 | $ 15.4 | $ 12.1
Minimum rent payments allocated to financing obligations | 7.5 | 10.2 | 0.4
Minimum rent payments allocated to deferred rent amortization | 0.5 |  |
Remaining minimum rent payments represent land rent expense | $ 7.2 | $ 6.7 | $ 3.6

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- Definition Build to suit lease transaction deferred rent amortization. + References No definition available. + Details
Name: | rh_BuildToSuitLeaseTransactionDeferredRentAmortization
Namespace Prefix: | rh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Build to suit lease transaction financing obligations. + References No definition available. + Details
Name: | rh_BuildToSuitLeaseTransactionFinancingObligations
Namespace Prefix: | rh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest expense for the reporting period incurred under leases accounted for as build-to-suit lease transactions or financing leases. + References No definition available. + Details
Name: | rh_BuildToSuitLeaseTransactionInterestExpense
Namespace Prefix: | rh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Build to suit lease transaction land rent expense. + References No definition available. + Details
Name: | rh_BuildToSuitLeaseTransactionLandRentExpense
Namespace Prefix: | rh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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