INDEBTEDNESS - Summary of Debt Activity (Details) - USD ($)	3 Months Ended
	Apr. 02, 2022	Dec. 31, 2021
Debt
Balance at the beginning of the period	$ 246,000,000.0
Borrowings	0
Repayments	(3,300,000)
Other	0
Balance at the end of the period	242,700,000
Less: short-term debt	2,000,000.0	$ 2,200,000
Less: current maturities of long-term debt	13,000,000.0	13,000,000.0
Long-term debt	227,700,000	230,800,000
Trade receivables financing arrangement
Debt
Balance at the beginning of the period	0
Borrowings	0
Repayments	0
Other	0
Balance at the end of the period	0
Maximum borrowing capacity under financing arrangement	50,000,000.0
Other indebtedness
Debt
Balance at the beginning of the period	3,300,000
Borrowings	0
Repayments	(200,000)
Other	0
Balance at the end of the period	3,100,000
Purchase card programs	2,000,000.0	2,200,000
Finance lease, liability	1,100,000	1,100,000
Revolving loans | Current Revolving SPX Facilities
Debt
Balance at the beginning of the period	0
Borrowings	0
Repayments	0
Other	0
Balance at the end of the period	0
Term loan | Current SPX Term Loan Facilities
Debt
Balance at the beginning of the period	242,700,000
Borrowings	0
Repayments	(3,100,000)
Other	0
Balance at the end of the period	239,600,000
Face amount of debt	250,000,000.0
Unamortized debt issuance costs	$ 1,000,000.0	$ 1,000,000.0
Term loan | Current SPX Term Loan Facilities | 2022 and 2023
Debt
Periodic payment (as a percent of principal)	1.25%
Term loan | Current SPX Term Loan Facilities | First three quarters of 2024
Debt
Periodic payment (as a percent of principal)	1.25%