Document and Entity Information	3 Months Ended
	Dec. 31, 2016 shares
Document And Entity Information [Abstract]
Entity Registrant Name	DEEP WELL OIL & GAS INC
Entity Central Index Key	0000869495
Trading Symbol	DWOG
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Type	10-Q
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Entity Filer Category	Smaller Reporting Company
Entity Common Stock Shares Outstanding	229,374,605