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Financial Assets and Liabilities that are Measured At Fair Value and are Categorized Using Fair Value Hierarchy (Detail) - Fair Value, Measurements, Recurring - USD ($) | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 20,875,000 | $ 10,266,000
Financial Liabilities | 0 | 0
Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Financial Liabilities | 4,237,000 | 1,780,000
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Financial Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Financial Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 20,875,000 | 10,266,000
Financial Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Financial Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring |  | 0
Financial Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Financial Liabilities | $ 4,237,000 | $ 1,780,000

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- Definition Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] + References No definition available. + Details
Name: | midd_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems
Namespace Prefix: | midd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |