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FAIR VALUE - Schedule of Fair Value of Debt (Details) - Senior Notes - USD ($) $ in Thousands | Jun. 27, 2020 | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | --- | ---
2026 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.50% |  | 5.50%
2026 Senior Notes | Book Value |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument value | $ 500,000 | $ 500,000 |
2026 Senior Notes | Estimated Fair Value |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument value | $ 521,850 | $ 537,500 |
2028 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.25% | 4.25% |
2028 Senior Notes | Book Value |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument value | $ 500,000 | $ 500,000 |
2028 Senior Notes | Estimated Fair Value |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument value | $ 497,500 | $ 510,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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