Document And Entity Information	9 Months Ended
	Mar. 31, 2015	May 08, 2015
Document Information [Line Items]
Entity Registrant Name	NAPCO SECURITY TECHNOLOGIES, INC
Entity Central Index Key	0000069633
Current Fiscal Year End Date	--06-30
Entity Filer Category	Smaller Reporting Company
Trading Symbol	NSSC
Entity Common Stock, Shares Outstanding		18,968,628
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2015