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Subsequent Event (Details) - Subsequent Event - Facilities Consolidation Plan $ in Millions	Mar. 14, 2018 USD ($)
Subsequent Event [Line Items]
Expected annual cost reductions	$ 4
Term of cost saving initiatives	3 years
Minimum
Subsequent Event [Line Items]
Estimated future restructuring and related charges	$ 6
Maximum
Subsequent Event [Line Items]
Estimated future restructuring and related charges	$ 8

X

- Definition

Restructuring and Related Cost, Expected Annual Cost Reductions

+ References

No definition available.

+ Details

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

X

- Definition

Restructuring and Related Cost, Term of Plan

+ References

No definition available.

+ Details

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Namespace Prefix:	mlhr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expected cost remaining for the specified restructuring cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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