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SPECIAL CHARGES, NET - Analysis of Restructuring Liabilities (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Oct. 01, 2022 | Sep. 30, 2023 | Oct. 01, 2022
Restructuring liabilities |  |  |  |
Balance at beginning of year |  |  | $ 0 | $ 300,000
Special charges | $ 0 | $ 0 | 0 | 100,000
Utilization — cash |  |  | 0 | (400,000)
Currency translation adjustment and other |  |  | 0 | 0
Balance at end of period | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. Also includes integration reserves. + References No definition available. + Details
Name: | spxc_RestructuringAndIntegrationReserves
Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Restructuring and Integration Reserves, Settled with Cash + References No definition available. + Details
Name: | spxc_RestructuringAndIntegrationReservesSettledWithCash
Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of change in the restructuring and integration reserves related to foreign currency translation adjustments and any other adjustments not separately disclosed or provided for elsewhere in the Taxonomy. + References No definition available. + Details
Name: | spxc_RestructuringAndIntegrationReservesTranslationAndOtherAdjustment
Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount charged against earnings in the period for incurred and estimated costs associated with an exit from business activities or restructuring pursuant to a duly authorized plan, excluding asset retirement obligations. Such costs include charges associated with employee terminations, lease terminations, asset impairments, etc. + References No definition available. + Details
Name: | spxc_SpecialCharges
Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_RestructuringReserveRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration