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Leases - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2020 | Jan. 31, 2020 | Jun. 20, 2019 | May 19, 2019 | Jun. 20, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Lease renewal term |  |  |  |  |  | 5 years |  |  |  |
Finance lease, term of contractt |  |  |  | 15 years |  |  |  |  | 15 years |
Finance lease, renewal term |  |  |  | 5 years |  |  |  |  | 5 years | 10 years
Unrecognized deferred gains, topic 840 |  |  |  |  |  | $ 84,000 |  | $ 85,800 |  |
Proceeds from real estate financing transactions |  |  |  |  |  | $ 78,263 | $ 44,822 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  | 15 years |  |  |  |
Warehouse faciility |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finance lease, renewal term |  |  |  |  |  | 5 years |  |  |  |
Proceeds from real estate financing transactions | $ 7,500 | $ 34,100 |  |  | $ 45,000 | $ 78,300 |  | $ 27,200 |  |
Warehouse faciility | Minimum |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finance lease, term of contractt |  |  |  |  |  | 15 years |  |  |  |
Warehouse faciility | Maximum |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Finance lease, term of contractt |  |  |  |  |  | 18 years |  |  |  |
Warehouse faciility | University Park, IL |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from real estate financing transactions |  |  |  | $ 21,800 |  |  |  |  |  |
Warehouse faciility | Yulee, FL |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from real estate financing transactions |  |  | $ 13,300 |  |  |  |  |  |  |

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- Definition Term of lessee's finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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