LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
	Oct. 01, 2024	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt		$ 2,696,693	$ 2,896,506
2022 Revolving Credit Agreement | Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity		500,000
Available borrowing capacity		425,000
Line of Credit | 2022 Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		520,000
Swingline sublimit		125,000
Letter of credit sublimit		75,000
Available borrowing capacity		$ 445,000
Line of Credit | Rural Energy Savings Program Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000
Interest rate (as a percent)	0.00%
Term of issuance	10 years
Special draw capacity	$ 3,000
Letter of credit, proportion of amount drawn (as a percent)	50.00%
Line of Credit | Rural Energy Savings Program Loan | Subsequent Event
Debt Instrument [Line Items]
Letter of credit outstanding	$ 3,000
Line of Credit | Rural Energy Savings Program Loan | Electrify and Save® On-Bill Repayment Program
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000
Line of Credit | Rural Energy Savings Program Loan | Work Plan with Rural Utility Service
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000
Minimum
Debt Instrument [Line Items]
Equity to capitalization ratio (ECR) requirement (as a percent)		18.00%
Debt service ratio (DSR) requirement		1.025
Minimum | All Other Long-Term Debt
Debt Instrument [Line Items]
Debt service ratio (DSR) requirement		1.10
Minimum | Springerville certificates, Series B, 7.14%, due through 2033 | Mortgages
Debt Instrument [Line Items]
Debt service ratio (DSR) requirement		1.02