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Goodwill and Indefinite-lived Intangibles (Details) $ in Millions	3 Months Ended
	Sep. 01, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning	$ 304.1
Foreign currency translation adjustments	(0.2)
Goodwill, ending	303.9
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-Lived Intangible Assets (Excluding Goodwill), beginning	78.1
Foreign currency translation adjustments	0.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), ending	78.1
Rollforward of Goodwill and Indefinite-lived Intangible Assets [Roll Forward]
Goodwill and indefinite-lived intangibles, beginning	382.2
Foreign currency translation adjustments	(0.2)
Goodwill and indefinite-lived intangibles, ending	$ 382.0

X

- Definition

Goodwill And Other Non Amortizable Intangibles.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlhr_
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Balance Type:	debit
Period Type:	instant

X

- Definition

The change during the reporting period in the carrying value of Goodwill and indefinite-lived intangible assets.

+ References

No definition available.

+ Details

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X

- Definition

Rollforward of Goodwill and Indefinite-lived Intangible Assets [Roll Forward]

+ References

No definition available.

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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X

- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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