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Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	7 Months Ended	9 Months Ended	0 Months Ended	5 Months Ended	0 Months Ended	3 Months Ended
	Aug. 30, 2014	Feb. 28, 2015	Feb. 28, 2015	Sep. 30, 2013	Mar. 01, 2014	Jul. 28, 2014	Nov. 30, 2013 dealerships	Aug. 31, 2013 dealerships	Mar. 01, 2014 dealerships	May 31, 2014
Business Acquisition
Long-term Line of Credit						$ 127.0us-gaap_LineOfCredit
Goodwill		303.7us-gaap_Goodwill	303.7us-gaap_Goodwill							228.2us-gaap_Goodwill
Design Within Reach
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired						81.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Purchase price		155.2us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Business Acquisition, Goodwill, Expected Tax Deductible Amount						10us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Percent	4.00%mlhr_NoncontrollingInterestDecreasefromRedemptionsorPurchaseofInterestsPercent / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	5.8us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Business Combination, Acquisition Related Costs			2.2us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Goodwill		76.2us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember	76.2us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Other intangible assets		69.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember	69.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Dongguan Sun Hing Steel Furniture Factory Ltd
Business Acquisition
Consideration transferred				8.2us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlhr_DongguanSunHingSteelFurnitureFactoryLtdMember	6.7us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlhr_DongguanSunHingSteelFurnitureFactoryLtdMember
Redeemable Noncontrolling Interest | Design Within Reach
Business Acquisition
Fair value of fully-vested options granted						$ 1.7us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_BalanceSheetLocationAxis = mlhr_RedeemableNoncontrollingInterestMember / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember
Herman Miller Consumer Holdings, Inc. | Design Within Reach
Business Acquisition
Capital Contributed, Percentage of Acquiree	15.00%mlhr_CapitalContributedPercentageofAcquiree / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / dei_LegalEntityAxis = mlhr_HermanMillerConsumerHoldingsInc.Member
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners						7.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / dei_LegalEntityAxis = mlhr_HermanMillerConsumerHoldingsInc.Member
ARKANSAS | Wholly-owned Contract Furniture Dealership
Business Acquisition
Numbers of Business Divested							1mlhr_NumbersofBusinessesDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlhr_WhollyownedcontractfurnituredealershipMember / us-gaap_StatementGeographicalAxis = stpr_AR
OREGON | Wholly-owned Contract Furniture Dealership
Business Acquisition
Numbers of Business Divested								1mlhr_NumbersofBusinessesDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlhr_WhollyownedcontractfurnituredealershipMember / us-gaap_StatementGeographicalAxis = stpr_OR
MONTREAL | Wholly-owned Contract Furniture Dealership
Business Acquisition
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