INDEBTEDNESS - Summary of Debt Activity (Details) - USD ($)	6 Months Ended
	Jul. 02, 2022	Dec. 31, 2021
Debt
Balance at the beginning of the period	$ 246,000,000.0
Borrowings	100,000
Repayments	(6,600,000)
Other	100,000
Balance at the end of the period	239,600,000
Less: short-term debt	2,100,000	$ 2,200,000
Less: current maturities of long-term debt	13,000,000.0	13,000,000.0
Long-term debt	224,500,000	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	100,000
Repayments	(300,000)
Other	0
Balance at the end of the period	3,100,000
Purchase card programs	2,100,000	2,200,000
Finance lease, liability	1,000,000.0	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	(6,300,000)
Other	100,000
Balance at the end of the period	236,500,000
Face amount of debt	250,000,000.0
Unamortized debt issuance costs	$ 900,000	$ 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%