401(k) Plan (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Napco 401 (k) Plan [Member]
Schedule of Deferred Compensation Plans [Line Items]
Deferred compensation plan expense	$ 23,000	$ 0	$ 44,000	$ 0
Marks 401 (k) Plan [Member]
Schedule of Deferred Compensation Plans [Line Items]
Deferred compensation plan expense	$ 1,000	$ 0	$ 2,000	$ 0