DOCUMENT AND ENTITY INFORMATION (USD $)	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
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		179,597,113
Entity Public Float		$ 52,000,000