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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 28, 2019 USD ($) lease_extension | Dec. 30, 2018 USD ($) | Dec. 29, 2018 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |  |
Retained earnings |  | $ 505,714 |  | $ 504,909
Right-of-use Operating / Finance Leases |  | 74,244 |  |
Lease liability |  | $ 82,150 |  |
Manufacturing Facility |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Deferred gain |  |  |  | $ 5,100
Term of lease | 10 years |  |  |
Net proceeds from sale of facility | $ 16,900 |  |  |
Real Estate |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of options to extend | lease_extension |  | 1 |  |
Real Estate | Leased Assets |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease concentration |  | 85.00% |  |
Equipment | Leased Assets |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease concentration |  | 15.00% |  |
Minimum | Real Estate |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease extension term |  | 1 year |  |
Maximum | Real Estate |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease extension term |  | 10 years |  |
Impact of Implementation of Lease Guidance |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Retained earnings |  |  | $ 3,000 |
Right-of-use asset and liability calculation offset |  |  | 300 |
Right-of-use Operating / Finance Leases |  |  | 73,800 |
Lease liability |  |  | 82,000 |
Impact of Implementation of Lease Guidance | Manufacturing Facility |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Deferred gain |  |  | $ 3,300 |

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