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Long-Term Obligations ABL Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Mar. 21, 2014
Mar. 18, 2011
Dec. 31, 2014
Mar. 25, 2013
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis LIBOR        
Debt, weighted average interest rate 2.263%us-gaap_DebtWeightedAverageInterestRate     2.263%us-gaap_DebtWeightedAverageInterestRate  
Subsidiary ownership percentage 100.00%emax_SubsidiaryOwnershipPercentage     100.00%emax_SubsidiaryOwnershipPercentage  
Seasonal Overadvance A          
Debt Instrument [Line Items]          
Debt Instrument Percentage of Principal Used   10.00%emax_DebtInstrumentPercentageofPrincipalUsed
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceAMember
     
Seasonal Overadvance B          
Debt Instrument [Line Items]          
Debt Instrument Percentage of Principal Used   10.00%emax_DebtInstrumentPercentageofPrincipalUsed
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceBMember
     
Line of credit          
Debt Instrument [Line Items]          
Line of credit facility additional borrowing capacity seasonal overadvance A   $ 15.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceA
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit facility additional borrowing capacity seasonal overadvance B   9.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceB
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit facility additional borrowing capacity seasonal overadvance C   6.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceC
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit | ABL Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity     70us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Line of credit facility, remaining borrowing capacity 34.4us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    34.4us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Minimum excess availability reserve   1.0emax_MinimumExcessAvailabilityReserve
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Seasonal overadvance fee   0.20%emax_SeasonalOveradvanceFee
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Debt, weighted average interest rate 2.405%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    2.405%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Foreign restricted subsidiaries, percent of voting capital stock, collateral     65.00%emax_ForeignRestrictedSubsidiariesPercentOfVotingCapitalStockCollateral
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Foreign restricted subsidiaries, percent of non-voting capital stock collateral     100.00%emax_ForeignRetrictedSubsidiariesPercentOfNonVotingCapitalStockCollateral
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Amended excess availability threshold percenatge that triggers a minimum consolidated fixed charge coverage ratio         12.50%emax_AmendedExcessAvailabilityThresholdPercenatgeThatTriggersMinimumConsolidatedFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Excess availability threshold percentage that triggers a minimum consolidated fixed charge coverage ratio 12.50%emax_ExcessAvailabilityThresholdPercenatgeThatTriggersMinimumConsolidatedFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    12.50%emax_ExcessAvailabilityThresholdPercenatgeThatTriggersMinimumConsolidatedFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of credit | ABL Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt Instrument Basis Spread On Variable Rate Alternative     1.00%emax_DebtInstrumentBasisSpreadOnVariableRateAlternative
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Line of credit | ABL Credit Facility | Federal Funds          
Debt Instrument [Line Items]          
Debt Instrument Basis Spread On Variable Rate Alternative     0.50%emax_DebtInstrumentBasisSpreadOnVariableRateAlternative
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= emax_FederalFundsMember
   
Line of credit | ABL Credit Facility | Minimum          
Debt Instrument [Line Items]          
Debt covenant, required fixed charge coverage ratio   1.00emax_DebtConvenantRequiredFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Line of credit facility, unused capacity, commitment fee percentage     0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Line of credit | ABL Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Margin rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
  1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Line of credit | ABL Credit Facility | Minimum | Base Rate          
Debt Instrument [Line Items]          
Margin rate 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
  1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Line of credit | ABL Credit Facility | Maximum          
Debt Instrument [Line Items]          
Debt convenant, required fixed charge coverage ratio when excess availability is less than 15%     1.15emax_DebtConvenantRequiredFixedChargeCoverageRatioWhenExcessAvailabiltiyIsLessThanFifteenPercent
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Line of credit facility, unused capacity, commitment fee percentage     0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Line of credit | ABL Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Margin rate 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
  2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Line of credit | ABL Credit Facility | Maximum | Base Rate          
Debt Instrument [Line Items]          
Margin rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
  1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Line of credit | Seasonal Overadvance A          
Debt Instrument [Line Items]          
Debt covenant, required fixed charge coverage ratio   1.00emax_DebtConvenantRequiredFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit facility additional borrowing capacity seasonal overadvance A   15.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceA
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceAMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit | Seasonal Overadvance B          
Debt Instrument [Line Items]          
Debt covenant, required fixed charge coverage ratio   1.00emax_DebtConvenantRequiredFixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit facility additional borrowing capacity seasonal overadvance B   9.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceB
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceBMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Line of credit | Seasonal Overadvance C          
Debt Instrument [Line Items]          
Line of credit facility additional borrowing capacity seasonal overadvance C   6.0emax_LineOfCreditFacilityAdditionalBorrowingCapacitySeasonalOveradvanceC
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Minimum consolidated ebitda after fiscal year 2014   52.0emax_Minimumconsolidatedebitdaafterfiscalyear2014
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Minimum consolidated ebitda fiscal year 2014   $ 50.0emax_Minimumconsolidatedebitdafiscalyear2014
/ us-gaap_DebtInstrumentAxis
= emax_SeasonalOveradvanceCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember