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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2015 | Mar. 01, 2014 | Feb. 28, 2015 | Mar. 01, 2014
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Allocated Share-based Compensation Expense | $ 2.4 us-gaap_AllocatedShareBasedCompensationExpense | $ 2.7 us-gaap_AllocatedShareBasedCompensationExpense | $ 8.1 us-gaap_AllocatedShareBasedCompensationExpense | $ 8.3 us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 0.8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 1.0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 2.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 3.0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 258,927 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 412,541 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Common Stock, Capital Shares Reserved for Future Issuance | 4,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  | 4,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |
Percent of Market Price | 85.00%mlhr_PercentOfMarketPrice |  | 85.00%mlhr_PercentOfMarketPrice |
Restricted Stock Units (RSUs) |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised |  |  | 130,144 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 108,947 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion Ratio to Common Stock |  |  | 1 mlhr_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConversionRatiotoCommonStock / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years |
Restricted Stock [Member] |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 5 years |
Phantom Share Units (PSUs) [Member] |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion Ratio to Common Stock |  |  | 1 mlhr_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConversionRatiotoCommonStock / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |
Minimum | Restricted Stock Units (RSUs) |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |
Minimum | Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 1 year |
Maximum | Restricted Stock Units (RSUs) |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 5 years |
Maximum | Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |
Herman Miller Consumer Holdings | Minimum | Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 1 year |
Herman Miller Consumer Holdings | Maximum | Employee Stock Option |  |  |  |
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 5 years |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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