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Debt Debt - Phantom (Details) (USD $)
In Millions, unless otherwise specified
Jul. 28, 2014
Nov. 29, 2014
May 31, 2014
Line of Credit Facility      
Long-term Line of Credit $ 127.0us-gaap_LineOfCredit    
South China Ops | Revolving Line of Credit, Foreign      
Line of Credit Facility      
Long-term Line of Credit   0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditForeignMember
/ us-gaap_StatementGeographicalAxis
= mlhr_SouthChinaOpsMember
0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditForeignMember
/ us-gaap_StatementGeographicalAxis
= mlhr_SouthChinaOpsMember
Ningbo | Revolving Line of Credit, Foreign      
Line of Credit Facility      
Long-term Line of Credit   $ 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditForeignMember
/ us-gaap_StatementGeographicalAxis
= mlhr_NingboMember
$ 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mlhr_RevolvingLineOfCreditForeignMember
/ us-gaap_StatementGeographicalAxis
= mlhr_NingboMember