Document and Entity Information	12 Months Ended
	Sep. 30, 2017 USD ($) shares
Document and Entity Information
Entity Registrant Name	PIONEER FINANCIAL SERVICES INC
Entity Central Index Key	0001216752
Document Type	10-K
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float | $	$ 0
Entity Common Stock, Shares Outstanding | shares	1
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY