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Debt Debt - Phantom (Details) $ in Millions	Jun. 03, 2017 USD ($)
Debt Disclosure [Abstract]
Finance Leased Assets, Gross	$ 7.0

X

- Definition

Finance Leased Assets, Gross

+ References

No definition available.

+ Details

Name:	mlhr_FinanceLeasedAssetsGross
Namespace Prefix:	mlhr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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