Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2011	Nov. 25, 2011	Mar. 31, 2011
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Trading Symbol	DWOG
Entity Registrant Name	DEEP WELL OIL & GAS INC
Entity Central Index Key	0000869495
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		136,739,971
Entity Public Float			$ 9,800,000