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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) employee in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2020 business | Jan. 03, 2020 USD ($) site | Jan. 01, 2021 USD ($) employee site country | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($)
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of countries in which entity operates | country |  |  | 100 |  |
Number of employees | employee |  |  | 48 |  |
Number of businesses transferred | business | 2 |  |  |  |
Internal use software, useful life minimum |  | 3 years |  |  |
Internal use software, useful life maximum |  | 10 years |  |  |
Threshold for separate line item reporting of total current assets or total assets in Consolidated Balance Sheets |  | 5.00% | 5.00% |  |
Threshold for separate line item reporting of total current liabilities or total liabilities in Consolidated Balance Sheet |  | 5.00% | 5.00% |  |
Revenue recognized from performance obligations satisfied in previous periods | $ |  | $ 170 | $ 493 | $ 59 | $ 43
Number of sites with future environmental liabilities | site |  | 84 |  |  |
Number of sites owned | site |  |  | 9 |  |
Number of sites associated with former locations or operations | site |  |  | 65 |  |
Number of treatment or disposal sites not owned | site |  |  | 10 |  |
Accrual for environment loss contingencies | $ |  |  | $ 117 |  |
Engineers And Scientists |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of employees | employee |  |  | 19 |  |
Maximum | Building |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 45 years |  |  |
Maximum | Machinery and Equipment |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |
Minimum | Building |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 2 years |  |  |
Minimum | Machinery and Equipment |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 2 years |  |  |
Other current assets |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Capitalized costs to obtain or fulfill a contract | $ |  | $ 14 | $ 14 |  |
Other non-current assets |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Capitalized costs to obtain or fulfill a contract | $ |  | $ 48 | $ 35 |  |

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