Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2016	Sep. 06, 2016	Dec. 31, 2015
Document Information [Line Items]
Entity Registrant Name	NAPCO SECURITY TECHNOLOGIES, INC
Entity Central Index Key	0000069633
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 69,768,521
Trading Symbol	NSSC
Entity Common Stock, Shares Outstanding		18,786,893