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Operating Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
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Nov. 29, 2014 | Nov. 30, 2013 | Nov. 29, 2014 | Nov. 30, 2013 | May 31, 2014
Segment Reporting Information |  |  |  |  |
Net Sales: | $ 565.4 us-gaap_SalesRevenueNet | $ 470.5 us-gaap_SalesRevenueNet | $ 1,075.1 us-gaap_SalesRevenueNet | $ 938.6 us-gaap_SalesRevenueNet |
Depreciation and Amortization: | 13.2 us-gaap_DepreciationDepletionAndAmortization | 10.5 us-gaap_DepreciationDepletionAndAmortization | 25.2 us-gaap_DepreciationDepletionAndAmortization | 21.6 us-gaap_DepreciationDepletionAndAmortization |
Operating Earnings: | 46.7 us-gaap_OperatingIncomeLoss | (125.2)us-gaap_OperatingIncomeLoss | 88.9 us-gaap_OperatingIncomeLoss | (86.1)us-gaap_OperatingIncomeLoss |
Capital Expenditures: | 18.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 13.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 26.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 20.0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Total Assets: | 1,193.9 us-gaap_Assets |  | 1,193.9 us-gaap_Assets |  | 990.9 us-gaap_Assets
Total Goodwill: | 303.9 us-gaap_Goodwill |  | 303.9 us-gaap_Goodwill |  | 228.2 us-gaap_Goodwill
North American Furniture Solutions |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net Sales: | 315.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 297.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 636.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 615.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |
Depreciation and Amortization: | 7.0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 7.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 14.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 14.7 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |
Operating Earnings: | 32.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | (119.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 68.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | (85.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |
Capital Expenditures: | 11.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 10.8 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 15.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember | 15.3 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |
Total Assets: | 509.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |  | 509.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |  | 457.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember
Total Goodwill: | 135.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |  | 135.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember |  | 135.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_NorthAmericaFurnitureSolutionsMember
ELA Furniture Solutions |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net Sales: | 114.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 103.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 209.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 184.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |
Depreciation and Amortization: | 2.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 1.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 4.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 3.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |
Operating Earnings: | 10.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 8.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 13.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 8.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |
Capital Expenditures: | 4.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 1.2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 6.3 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember | 2.6 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |
Total Assets: | 238.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |  | 238.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |  | 244.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember
Total Goodwill: | 42.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |  | 42.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember |  | 42.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ELAFurnitureSolutionsMember
Specialty |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net Sales: | 55.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 53.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 110.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 105.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |
Depreciation and Amortization: | 1.8 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 1.3 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 3.5 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 3.0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |
Operating Earnings: | 2.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | (8.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 5.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | (7.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |
Capital Expenditures: | 1.1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 1.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 2.2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember | 2.1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |
Total Assets: | 155.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |  | 155.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |  | 157.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember
Total Goodwill: | 49.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |  | 49.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember |  | 49.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_SpecialtyMember
Consumer |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net Sales: | 80.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 17.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 119.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 33.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |
Depreciation and Amortization: | 2.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 0.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 3.0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 0.5 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |
Operating Earnings: | 1.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | (1.3)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 3.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 2.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |
Capital Expenditures: | 1.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 2.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |
Total Assets: | 219.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |  | 219.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |  | 18.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember
Total Goodwill: | 76.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |  | 76.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlhr_ConsumerMember
Corporate |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Net Sales: | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Depreciation and Amortization: | 0.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Operating Earnings: | (0.3)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Capital Expenditures: | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Total Assets: | 71.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 71.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 112.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Total Goodwill: | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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