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v2.4.1.9

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Feb. 28, 2015 | May 31, 2014
Schedule of Warranty Accrual |  |
Warranty Length | 12 years |
Performance Guarantee |  |
Schedule of Warranty Accrual |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 9.1 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember |
Guarantor Obligations, Current Carrying Value | 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember | 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_PerformanceGuaranteeMember
Financial Standby Letter of Credit |  |
Schedule of Warranty Accrual |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 8.3 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialStandbyLetterOfCreditMember |
Guarantor Obligations, Current Carrying Value | 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialStandbyLetterOfCreditMember | 0 us-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 | 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlhr_NecessaryMaintenanceAndRepairsMember |
Loss Contingency, Range of Possible Loss, Maximum | 3.0 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlhr_NecessaryMaintenanceAndRepairsMember |
Other Accrued Liabilities | Necessary Maintenance And Repairs |  |
Schedule of Warranty Accrual |  |
Loss Contingency Accrual | 1.2 us-gaap_LossContingencyAccrualAtCarryingValue / mlhr_FinancialStatementLocationAxis = mlhr_OtherAccruedLiabilitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlhr_NecessaryMaintenanceAndRepairsMember | $ 1.5 us-gaap_LossContingencyAccrualAtCarryingValue / mlhr_FinancialStatementLocationAxis = mlhr_OtherAccruedLiabilitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlhr_NecessaryMaintenanceAndRepairsMember

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