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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 29, 2014	Nov. 30, 2013	Nov. 29, 2014	Nov. 30, 2013
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Allocated Share-based Compensation Expense	$ 2.7us-gaap_AllocatedShareBasedCompensationExpense	$ 2.8us-gaap_AllocatedShareBasedCompensationExpense	$ 5.7us-gaap_AllocatedShareBasedCompensationExpense	$ 5.6us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 1.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 1.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 2.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 2.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			226,867us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	390,080us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Common Stock, Capital Shares Reserved for Future Issuance	4,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance		4,000,000us-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			121,985us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	93,041us-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			1mlhr_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			1mlhr_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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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.

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