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Summary of Notes Payable and Obligations under Capital Leases (Detail) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases $ 11,685,000us-gaap_DebtAndCapitalLeaseObligations $ 12,955,000us-gaap_DebtAndCapitalLeaseObligations
Less current maturities of notes payable and obligations under capital leases (6,752,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (9,258,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Notes payable and obligations under capital leases less current maturities 4,933,000us-gaap_LongTermDebtAndCapitalLeaseObligations 3,697,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Obligations under capital leases    
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases 1,321,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
1,768,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Term Note    
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases   4,770,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_TermNoteMember
Second Term Note    
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases 2,287,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_SecondTermNoteMember
5,616,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_SecondTermNoteMember
Third Term Note    
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases 7,594,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_ThirdTermNoteMember
 
DSS Term Note    
Line of Credit Facility [Line Items]    
Notes payable and obligations under capital leases $ 483,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_DssTermNoteMember
$ 801,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_CreditFacilityAxis
= dwsn_DssTermNoteMember