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401(k) Plan (Narrative) (Detail) (Napco Technologies 401 k Plan [Member], USD $) | 3 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Napco Technologies 401 k Plan [Member] |  |
Schedule of Deferred Compensation Plans [Line Items] |  |
Deferred compensation plan expense | $ 25,000 | $ 25,000

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