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Subsequent Event Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jan. 03, 2015
Nov. 29, 2014
Jul. 28, 2014
May 31, 2014
Jan. 05, 2015
Subsequent Event [Line Items]          
Long-term Line of Credit     $ 127.0us-gaap_LineOfCredit    
Long-term Line of Credit, Noncurrent   87.6mlhr_Borrowingsonrevolverandoutstandinglettersofcredit      
Letters of Credit Outstanding, Amount       4.9us-gaap_LettersOfCreditOutstandingAmount  
Extinguishment of Debt, Type [Domain]          
Subsequent Event [Line Items]          
Repayments of Debt 50.0us-gaap_RepaymentsOfDebt
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_ExtinguishmentOfDebtTypeDomain
       
Revolving Line of Credit, Domestic [Member]          
Subsequent Event [Line Items]          
Long-term Line of Credit   77.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditDomesticMember
     
Letters of Credit Outstanding, Amount   10.6us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditDomesticMember
     
Revolving Line of Credit, Domestic [Member] | Extinguishment of Debt, Type [Domain]          
Subsequent Event [Line Items]          
Long-term Line of Credit         126.2us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditDomesticMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_ExtinguishmentOfDebtTypeDomain
Long-term Line of Credit, Noncurrent         136.8mlhr_Borrowingsonrevolverandoutstandinglettersofcredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditDomesticMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_ExtinguishmentOfDebtTypeDomain
Letters of Credit Outstanding, Amount         $ 10.6us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditDomesticMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_ExtinguishmentOfDebtTypeDomain