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Summary of Significant Accounting Policies - Recent Accounting Standards Not Yet Adopted (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2020 | Mar. 28, 2020 | Dec. 29, 2019 | Dec. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 30, 2018 | Dec. 29, 2018
Recent Accounting Standards |  |  |  |  |  |  |  |
CRA elected package of practical expedients | true |  |  |  |  |  |  |
Operating lease right-of-use assets | $ 122,983 |  |  | $ 130,173 |  |  |  |
BALANCE AT DECEMBER 28, 2019 | 202,215 | $ 196,360 | $ 197,548 | 197,751 | $ 194,880 | $ 197,890 |  | $ 196,472
Cumulative-effect adjustment |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |
BALANCE AT DECEMBER 28, 2019 |  |  | (203) |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |
BALANCE AT DECEMBER 28, 2019 | $ 208,784 | $ 204,679 | 200,046 | $ 200,249 | $ 193,191 | $ 189,235 |  | $ 186,229
Retained Earnings | Cumulative-effect adjustment |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |
BALANCE AT DECEMBER 28, 2019 |  |  | (203) |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 82,300 |
Recognize lease liabilities |  |  |  |  |  |  | $ 106,800 |
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Retained Earnings | Cumulative-effect adjustment |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |
BALANCE AT DECEMBER 28, 2019 |  |  | $ (200) |  |  |  |  |

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- Definition Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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