XML 89 R43.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Business and Summary of Significant Accounting Policies - Stock-Based Compensation - Additional Information (Details) - shares shares in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of Shares Available for Grant | 2.1 |  |
Employee Stock Option |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award Option Vesting Period | 3 years |  |
Award Expiration Period | 10 years |  |
Performance-Based Stock Award [Member] | Minimum | 2019 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage | 0.00% |  |
Performance-Based Stock Award [Member] | Minimum | 2018 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage |  | 0.00% |
Performance-Based Stock Award [Member] | Minimum | 2017 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage |  |  | 0.00%
Performance-Based Stock Award [Member] | Maximum | 2019 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage | 200.00% |  |
Performance-Based Stock Award [Member] | Maximum | 2018 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage |  | 200.00% |
Performance-Based Stock Award [Member] | Maximum | 2017 Performance Stock Award Grant [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock Awards - Shares Awarded - Increase (Decrease), Percentage |  |  | 200.00%

X
- Definition Description of the period of time over which an employee's right to exercise an award is valid and after specified date options will expire, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
Name: | snbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpirationPeriod
Namespace Prefix: | snbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage by which a given share-based award (for example, number of shares granted) may increase or (decrease) based on the recipient meeting certain conditions or certain conditions occurring. For example, meeting performance conditions. + References No definition available. + Details
Name: | snbr_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardedSharesIncreaseDecreasePercentage
Namespace Prefix: | snbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=snbr_PerformanceBasedStockAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=snbr_A2019PerformanceStockAwardGrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=snbr_A2018PerformanceStockAwardGrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=snbr_A2017PerformanceStockAwardGrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |