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Commitments and Contingencies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2011
Sep. 30, 2012
Stock Appreciation Rights (SARs)        
Commitments and Contingencies        
Compensation expense $ 2.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_StockAppreciationRightsSARSMember
$ 4.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_StockAppreciationRightsSARSMember
   
Stock Appreciation Rights (SARs), 2011 Awards        
Commitments and Contingencies        
Grants approved by committee to employees for cash settled stock appreciation rights (in shares)     0.4hw_GrantsApprovedByCommitteeToEmployeesForCashSettledStockAppreciationRights
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2011AwardsMember
 
Grants approved by committee to employees for cash settled stock appreciation rights that remain outstanding (in shares) 0.1hw_GrantsApprovedByCommitteeToEmployeesForCashSettledStockAppreciationRightsOutstanding
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2011AwardsMember
     
Ending period for expected liability adjustment September 30, 2015      
Amount accrued for awards 0.9hw_AmountAccruedForAwards
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2011AwardsMember
     
Grant-date stock price (in dollars per share) $ 3.81hw_GrantDateStockPrice
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2011AwardsMember
     
Stock Appreciation Rights (SARS), 2012 Awards        
Commitments and Contingencies        
Grants approved by committee to employees for cash settled stock appreciation rights (in shares)       1.0hw_GrantsApprovedByCommitteeToEmployeesForCashSettledStockAppreciationRights
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
Grants approved by committee to employees for cash settled stock appreciation rights that remain outstanding (in shares) 0.3hw_GrantsApprovedByCommitteeToEmployeesForCashSettledStockAppreciationRightsOutstanding
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
     
Ending period for expected liability adjustment September 30, 2016      
Amount accrued for awards $ 5.8hw_AmountAccruedForAwards
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
     
Grant-date stock price (in dollars per share) $ 1.85hw_GrantDateStockPrice
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
     
Average stock price period 60 days      
Minimum | Stock Appreciation Rights (SARS), 2012 Awards        
Commitments and Contingencies        
Percentage of stock price on grant date 135.00%hw_PercentageOfStockPriceOnGrantDate
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Threshold stock price at which SARS will vest (in dollars per share) $ 2.50hw_ThresholdStockPrice
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= hw_StockAppreciationRightsSARS2012AwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember