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Aquisitions and Divestitures Acquisitions and Divestitures - Business Combinations Results of of Operations of Acquiree (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Feb. 28, 2015 | Mar. 01, 2014 | Feb. 28, 2015 | Mar. 01, 2014
Business Acquisition |  |  |  |
Net sales | $ 516.4 us-gaap_SalesRevenueNet | $ 455.9 us-gaap_SalesRevenueNet | $ 1,591.5 us-gaap_SalesRevenueNet | $ 1,394.5 us-gaap_SalesRevenueNet
Design Within Reach |  |  |  |
Business Acquisition |  |  |  |
Net sales | 59.5 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |  | 147.9 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |
Net sales impact to Herman Miller, Inc. | 52.5 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |  | 133.5 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |
Net loss | (0.5)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |  | (4.3)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember |
Intercompany Segment Eliminations | Design Within Reach |  |  |  |
Business Acquisition |  |  |  |
Net sales | $ (7.0)us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  | $ (14.4)us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = mlhr_DesignWithinReachMember / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |

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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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