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INDEBTEDNESS - Company-owned Life Insurance (Details) - USD ($)	Jun. 27, 2026	Dec. 31, 2025
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

X

- 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

X

- Definition

Life Insurance, Corporate or Bank Owned, Interest Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	spxc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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.

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X

- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant