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DEBT AND CREDIT SOURCES - Convertible Debt (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 17, 2020 USD ($) d $ / shares shares	Jan. 02, 2022 USD ($)	Jan. 03, 2021 USD ($)
Debt Instrument [Line Items]
Threshold trading days | d	60
Interest expense		$ 2,600	$ 1,700
Convertible debt | Green Convertible Notes
Debt Instrument [Line Items]
Principal amount	$ 200,000
Stated percentage	6.50%
Conversion price (USD per share) | $ / shares	$ 18.19
Conversion ratio, number of shares (in shares) | shares	54.9611
Conversion ratio, principal amount	$ 1
Threshold percentage of stock price trigger	130.00%
Convertible debt		145,800	135,100
Equity component of convertible debt		52,200	52,200
Unamortized discount		$ 45,500	53,800
Effective percentage		15.70%
Debt issuance cost		$ 8,700	11,100
Interest expense		23,700	10,400
If-converted value (below) in excess of principal		(47,200)	111,900
Convertible debt | Green Convertible Notes | Level 2
Debt Instrument [Line Items]
Fair value of debt		$ 218,500	$ 325,100

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- Definition

Debt Instrument, Convertible, Conversion Ratio, Principal Amount

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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