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CONTINGENT LIABILITIES AND OTHER MATTERS - Environmental Matters (Details) - Site investigation and remediation - site | Sep. 29, 2018 | Dec. 31, 2017
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Environmental Matters |  |
Number of sites | 28 | 28
Number of third-party disposal sites for which entity is potentially responsible | 15 |
Number of active sites | 10 |

X
- Definition Represents the number of offsite, third-party disposal sites which have been active in the past few years. + References No definition available. + Details
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Namespace Prefix: | spxc_
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Balance Type: | na
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X
- Definition Represents the number of sites which have liabilities for site investigation and remediation. + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of offsite, third-party disposal sites for which the entity is potentially responsible and have received notices of potential liability pursuant to various environmental laws. + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
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