XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Business and Summary of Significant Accounting Policies Business and Summary of Significant accounting Policies New Accounting Pronouncements (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2017 USD ($)
New Accounting Pronouncements [Abstract] |
Excess tax benefits reducing income tax expense | $ 1.4
Excess Tax Benefits From Share-based Compensation | $ 2.3

X
- Definition Effective Income Tax Rate Reconciliation - amount of excess tax benefits included in income tax expense (benefit). + References No definition available. + Details
Name: | snbr_EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsFromStockPlanAmount
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References No definition available. + Details
Name: | snbr_ExcessTaxBenefitsFromSharebasedCompensation
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition New Accounting Pronouncements [Abstract] + References No definition available. + Details
Name: | snbr_NewAccountingPronouncementsAbstract
Namespace Prefix: | snbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration