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Acquisitions and Divestitures - Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 7 Months Ended
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Feb. 28, 2015 | Feb. 28, 2015
Business Acquisition |  |
Trade Names and Trademarks | $ 55.1 us-gaap_IndefinitelivedIntangibleAssetsAcquired |
Design Within Reach |  |
Business Acquisition |  |
Total Intangible Assets Acquired | 69.3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember | 69.3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Exclusive Distribution Agreements | Design Within Reach |  |
Business Acquisition |  |
Finite-lived Intangible Assets Acquired |  | 0.2 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mlhr_ExclusiveDistributionAgreementsMember
Finite-Lived Intangible Asset, Useful Life |  | 1 year 6 months
Customer Relationships | Design Within Reach |  |
Business Acquisition |  |
Finite-lived Intangible Assets Acquired |  | 12.8 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Product Development Designs | Design Within Reach |  |
Business Acquisition |  |
Finite-lived Intangible Assets Acquired |  | 1.2 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mlhr_ProductDevelopmentDesignsMember
Finite-Lived Intangible Asset, Useful Life |  | 7 years
Trade Names | Design Within Reach |  |
Business Acquisition |  |
Trade Names and Trademarks |  | $ 55.1 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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