401(k) Plan (Narrative) (Detail) (Napco Technologies 401 k Plan [Member], USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Napco Technologies 401 k Plan [Member]
Schedule of Deferred Compensation Plans [Line Items]
Deferred compensation plan expense	$ 103,000	$ 89,000