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SPECIAL CHARGES, NET - Analysis of Restructuring Liabilities (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024
Restructuring liabilities |  |
Balance at beginning of year | $ 1.8 | $ 0.7
Special charges | 0.2 | 0.9
Utilization — cash | (1.6) | (0.9)
Balance at end of period | $ 0.4 | $ 0.7

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 Reserve increase representing the amount charged against earnings in the period for a specified incurred and estimated type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. Also includes the amount charged against earnings in the period for integration expenses. + References No definition available. + Details
Name: | spxc_RestructuringAndIntegrationReservesPeriodExpense
Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 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