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Condensed Consolidating Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Current assets:        
Cash and cash equivalents $ 79,723us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations $ 152,542us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations $ 154,233us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations $ 75,316us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
Trade receivables, net 91,366us-gaap_AccountsReceivableNetCurrent 119,330us-gaap_AccountsReceivableNetCurrent    
Inventories 63,565us-gaap_InventoryNet 50,633us-gaap_InventoryNet    
Current and deferred income taxes 11,218hw_CurrentAndDeferredIncomeTaxAssets 11,076hw_CurrentAndDeferredIncomeTaxAssets    
Other 12,146us-gaap_OtherAssetsCurrent 10,536us-gaap_OtherAssetsCurrent    
Total current assets 258,018us-gaap_AssetsCurrent 344,117us-gaap_AssetsCurrent    
Property, plant and equipment, net 182,249us-gaap_PropertyPlantAndEquipmentNet 182,111us-gaap_PropertyPlantAndEquipmentNet    
Other assets:        
Goodwill 175,512us-gaap_Goodwill 175,586us-gaap_Goodwill    
Intangible assets, net 152,812us-gaap_IntangibleAssetsNetExcludingGoodwill 159,863us-gaap_IntangibleAssetsNetExcludingGoodwill    
Other 34,645us-gaap_OtherAssetsNoncurrent 34,629us-gaap_OtherAssetsNoncurrent    
Total other assets 362,969hw_OtherAssetsNoncurrentTotal 370,078hw_OtherAssetsNoncurrentTotal    
Total assets 803,236us-gaap_Assets 896,306us-gaap_Assets 896,306us-gaap_Assets  
Current liabilities:        
Accounts payable 19,820us-gaap_AccountsPayableCurrent 27,026us-gaap_AccountsPayableCurrent    
Accrued personnel costs 32,575us-gaap_EmployeeRelatedLiabilitiesCurrent 48,902us-gaap_EmployeeRelatedLiabilitiesCurrent    
Accrued interest 2,721us-gaap_InterestPayableCurrent 18,273us-gaap_InterestPayableCurrent    
Current income taxes 0us-gaap_AccruedIncomeTaxesCurrent 368us-gaap_AccruedIncomeTaxesCurrent    
Other accrued liabilities 37,049us-gaap_OtherAccruedLiabilitiesCurrent 41,757us-gaap_OtherAccruedLiabilitiesCurrent    
Current portion of long-term debt 3,188us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent    
Total current liabilities 95,353us-gaap_LiabilitiesCurrent 136,326us-gaap_LiabilitiesCurrent    
Long-term liabilities:        
Long-term debt, net 559,129us-gaap_LongTermDebtNoncurrent 592,458us-gaap_LongTermDebtNoncurrent    
Income taxes 18,939hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent 23,242hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent    
Other 31,359us-gaap_OtherLiabilitiesNoncurrent 28,586us-gaap_OtherLiabilitiesNoncurrent    
Total long-term liabilities 609,427us-gaap_LiabilitiesNoncurrent 644,286us-gaap_LiabilitiesNoncurrent    
Total liabilities 704,780us-gaap_Liabilities 780,612us-gaap_Liabilities    
Redeemable non-controlling interest in consolidated subsidiary 12,829us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 13,252us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount    
Stockholders' equity:        
Common stock 74us-gaap_CommonStockValue 74us-gaap_CommonStockValue    
Capital in excess of par value 725,615us-gaap_AdditionalPaidInCapitalCommonStock 723,648us-gaap_AdditionalPaidInCapitalCommonStock    
Retained earnings (accumulated deficit) (639,306)us-gaap_RetainedEarningsAccumulatedDeficit (620,688)us-gaap_RetainedEarningsAccumulatedDeficit    
Treasury stock (756)us-gaap_TreasuryStockValue (592)us-gaap_TreasuryStockValue    
Total stockholders' equity 85,627us-gaap_StockholdersEquity 102,442us-gaap_StockholdersEquity    
Total liabilities and stockholders' equity 803,236us-gaap_LiabilitiesAndStockholdersEquity 896,306us-gaap_LiabilitiesAndStockholdersEquity    
Consolidation, Eliminations        
Current assets:        
Current and deferred income taxes (68,756)hw_CurrentAndDeferredIncomeTaxAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(23,149)hw_CurrentAndDeferredIncomeTaxAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets (68,756)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(23,149)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other assets:        
Investments in subsidiaries (521,141)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(406,327)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany accounts and notes (637,046)hw_IntercompanyAccountsAndNotesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(637,046)hw_IntercompanyAccountsAndNotesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred income taxes (73,777)us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(64,586)us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total other assets (1,231,964)hw_OtherAssetsNoncurrentTotal
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,107,959)hw_OtherAssetsNoncurrentTotal
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets (1,300,720)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,131,108)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Current liabilities:        
Current income taxes (68,756)us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(23,149)us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities (68,756)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(23,149)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-term liabilities:        
Income taxes (73,777)hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(64,586)hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany accounts and notes (693,695)hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(637,046)hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total long-term liabilities (767,472)us-gaap_LiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(701,632)us-gaap_LiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities (836,228)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(724,781)us-gaap_Liabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Stockholders' equity:        
Capital in excess of par value (543,167)us-gaap_AdditionalPaidInCapitalCommonStock
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(519,127)us-gaap_AdditionalPaidInCapitalCommonStock
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Retained earnings (accumulated deficit) 78,675us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
112,800us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total stockholders' equity (464,492)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(406,327)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities and stockholders' equity (1,300,720)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,131,108)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Guarantor Subsidiaries        
Current assets:        
Cash and cash equivalents 36,633us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
33,552us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
84,860us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
70,713us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Trade receivables, net 85,726us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
113,940us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories 60,857us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
48,482us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current and deferred income taxes 7,196hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
15,509hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 10,596us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
9,286us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets 201,008us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
220,769us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property, plant and equipment, net 162,422us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
162,458us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets:        
Goodwill 144,643us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
145,068us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intangible assets, net 124,836us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
131,150us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in subsidiaries 46,273us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
     
Deferred income taxes 50,188us-gaap_DeferredTaxAssetsNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
41,658us-gaap_DeferredTaxAssetsNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 10,894us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
14,388us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total other assets 376,834hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
332,264hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets 740,264us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
715,491us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current liabilities:        
Accounts payable 17,904us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
25,643us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued personnel costs 9,551us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
13,483us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current income taxes 47,658us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
23,198us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other accrued liabilities 27,939us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
36,811us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities 103,052us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
99,135us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term liabilities:        
Income taxes 64,117hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
65,133hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany accounts and notes   191,274hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 333us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
16,167us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total long-term liabilities 64,450us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
272,574us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities 167,502us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
371,709us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Stockholders' equity:        
Capital in excess of par value 486,069us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
458,498us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Retained earnings (accumulated deficit) 86,693us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(114,716)us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total stockholders' equity 572,762us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
343,782us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities and stockholders' equity 740,264us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
715,491us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non-Guarantor Subsidiaries        
Current assets:        
Cash and cash equivalents 2,975us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,764us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,094us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
34us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Trade receivables, net 5,640us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,390us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventories 2,708us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,151us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current and deferred income taxes 27,998hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
289hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 163us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
168us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current assets 39,484us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
13,762us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property, plant and equipment, net 10,304us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11,674us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other assets:        
Goodwill 30,869us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
30,518us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intangible assets, net 27,976us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
28,713us-gaap_IntangibleAssetsNetExcludingGoodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 2,180us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,381us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total other assets 61,025hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
60,612hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total assets 110,813us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
86,048us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current liabilities:        
Accounts payable 908us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
956us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accrued personnel costs 598us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
418us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current income taxes 5,122us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
319us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other accrued liabilities   3,006us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current liabilities 6,628us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
4,699us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-term liabilities:        
Income taxes 7,310hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
893hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany accounts and notes 177,035hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
4,061hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 15,457us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
774us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total long-term liabilities 199,802us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,728us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities 206,430us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
10,427us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Redeemable non-controlling interest in consolidated subsidiary 12,829us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
13,252us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Stockholders' equity:        
Capital in excess of par value 56,922us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
60,453us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Retained earnings (accumulated deficit) (165,368)us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,916us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total stockholders' equity (108,446)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
62,369us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities and stockholders' equity 110,813us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
86,048us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Parent Company        
Current assets:        
Cash and cash equivalents 40,115us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
113,226us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
66,279us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,569us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Current and deferred income taxes 44,780hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,427hw_CurrentAndDeferredIncomeTaxAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 1,387us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,082us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 86,282us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
132,735us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property, plant and equipment, net 9,523us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,979us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets:        
Investments in subsidiaries 474,868us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
406,327us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany accounts and notes 637,046hw_IntercompanyAccountsAndNotesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
637,046hw_IntercompanyAccountsAndNotesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred income taxes 23,589us-gaap_DeferredTaxAssetsNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
22,928us-gaap_DeferredTaxAssetsNetNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 21,571us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,860us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total other assets 1,157,074hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,085,161hw_OtherAssetsNoncurrentTotal
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 1,252,879us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,225,875us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current liabilities:        
Accounts payable 1,008us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
427us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued personnel costs 22,426us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
35,001us-gaap_EmployeeRelatedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued interest 2,721us-gaap_InterestPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,273us-gaap_InterestPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current income taxes 21,098us-gaap_AccruedIncomeTaxesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Other accrued liabilities 3,988us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,940us-gaap_OtherAccruedLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current portion of long-term debt 3,188us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Total current liabilities 54,429us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
55,641us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term liabilities:        
Long-term debt, net 559,129us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
592,458us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income taxes 21,289hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21,802hw_DeferredTaxLiabilityAndUnrecognizedTaxBenefitsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany accounts and notes 516,660hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
441,711hw_IntercompanyAccountsAndNotesPayableNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 15,569us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,645us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total long-term liabilities 1,112,647us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,067,616us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities 1,167,076us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,123,257us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Stockholders' equity:        
Common stock 74us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
74us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Capital in excess of par value 725,791us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
723,824us-gaap_AdditionalPaidInCapitalCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Retained earnings (accumulated deficit) (639,306)us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(620,688)us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Treasury stock (756)us-gaap_TreasuryStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(592)us-gaap_TreasuryStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total stockholders' equity 85,803us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
102,618us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and stockholders' equity $ 1,252,879us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 1,225,875us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember