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Business and Summary of Significant Accounting Policies - Operating Leases - Summary of Deferred Lease Incentives (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Operating Leased Assets [Line Items] |  |
Deferred lease incentives | $ 14,772 | $ 12,472
Other Current Liabilities |  |
Operating Leased Assets [Line Items] |  |
Deferred lease incentives, Current | 2,842 | 2,784
Other Non-current Liabilities |  |
Operating Leased Assets [Line Items] |  |
Deferred lease incentives, Non-current | $ 11,930 | $ 9,688

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- Definition Deferred lease incentives. + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of unamortized lease incentives which is expected to be amortized to rent expense within one year. + References No definition available. + Details
Name: | snbr_DeferredLeaseIncentivesCurrent
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of unamortized lease incentives which is expected to be amortized to rent expense more than one year after the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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