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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Nov. 29, 2014
May 31, 2014
Schedule of Warranty Accrual    
Warranty Length 12 years  
Performance Guarantee    
Schedule of Warranty Accrual    
Guarantor Obligations, Maximum Exposure, Undiscounted 10.4us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember
 
Guarantor Obligations, Current Carrying Value 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember
0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PerformanceGuaranteeMember
Financial Standby Letter of Credit    
Schedule of Warranty Accrual    
Guarantor Obligations, Maximum Exposure, Undiscounted 10.6us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
 
Guarantor Obligations, Current Carrying Value 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
Minimum | Performance Guarantee    
Schedule of Warranty Accrual    
Guarantor Obligations, Period 1 year  
Maximum | Performance Guarantee    
Schedule of Warranty Accrual    
Guarantor Obligations, Period 3 years  
Necessary Maintenance And Repairs    
Schedule of Warranty Accrual    
Loss Contingency, Range of Possible Loss, Minimum 0us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mlhr_NecessaryMaintenanceAndRepairsMember
 
Loss Contingency, Range of Possible Loss, Maximum 3.0us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mlhr_NecessaryMaintenanceAndRepairsMember
 
Other Accrued Liabilities | Necessary Maintenance And Repairs    
Schedule of Warranty Accrual    
Loss Contingency Accrual 1.2us-gaap_LossContingencyAccrualAtCarryingValue
/ mlhr_FinancialStatementLocationAxis
= mlhr_OtherAccruedLiabilitiesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mlhr_NecessaryMaintenanceAndRepairsMember
$ 1.5us-gaap_LossContingencyAccrualAtCarryingValue
/ mlhr_FinancialStatementLocationAxis
= mlhr_OtherAccruedLiabilitiesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mlhr_NecessaryMaintenanceAndRepairsMember