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Commitments And Contingencies - Narrative (Details) (USD $)
 6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Loss Contingencies    
Other receivables $ 11,831,000us-gaap_AccountsReceivableNetNoncurrent $ 11,831,000us-gaap_AccountsReceivableNetNoncurrent
Indian Tax Authority    
Loss Contingencies    
Service taxes paid 10,500,000atw_ServiceTaxesPaid
/ us-gaap_IncomeTaxAuthorityAxis
= atw_IndianGovernmentTaxAuthorityMember		  
Accrued additional service tax 1,300,000atw_AccruedServiceTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= atw_IndianGovernmentTaxAuthorityMember		  
Total service taxes 11,800,000atw_ServiceTaxesAccumulatedtoDate
/ us-gaap_IncomeTaxAuthorityAxis
= atw_IndianGovernmentTaxAuthorityMember		  
Other receivables $ 11,800,000us-gaap_AccountsReceivableNetNoncurrent
/ us-gaap_IncomeTaxAuthorityAxis
= atw_IndianGovernmentTaxAuthorityMember