Document and Entity Information - shares	6 Months Ended
	Jul. 28, 2017	Sep. 06, 2017
Document and Entity Information
Entity Registrant Name	99 CENTS ONLY STORES LLC
Entity Central Index Key	0001011290
Document Type	10-Q
Document Period End Date	Jul. 28, 2017
Amendment Flag	false
Current Fiscal Year End Date	--02-02
Entity Current Reporting Status	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		100
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2