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REVENUES FROM CONTRACTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 03, 2021	Jul. 03, 2021
Revenue from Contract with Customer [Abstract]
Increase (decrease) in contract with customers, net		$ (19.0)
Contract with customer, revenue recognized	$ 23.2	$ 38.3

X

- Definition

Increase (Decrease) in Contract with Customers, Net

+ References

No definition available.

+ Details

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Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration