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INDEBTEDNESS - Company-owned Life Insurance (Details) - USD ($) | Jun. 27, 2026 | Dec. 31, 2025
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Debt Disclosure [Abstract] |  |
Life insurance, corporate or bank owned, borrowed amounts | $ 0 | $ 0
Life insurance, corporate or bank owned, interest rate | 5.30% | 5.30%
Life Insurance Policy, Maximum Borrowing Capacity | $ 34,000,000.0 |
Life insurance, corporate or bank owned, amount | $ 59,400,000 | $ 60,300,000

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- Definition Life Insurance, Corporate or Bank Owned, Borrowed Amounts + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Life Insurance, Corporate or Bank Owned, Interest Rate + References No definition available. + Details
Name: | spxc_LifeInsuranceCorporateOrBankOwnedInterestRate
Namespace Prefix: | spxc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Life Insurance Policy, Maximum Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 325 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481612/325-30-25-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant