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