Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Exercisable stock options, included in the diluted earnings per share calculation			337,000	84,000
Common Stock Equivalents			72,000	2,000
Anit-dilutive exercisable stock options, not included in the diluted earnings per share calculation			8,000	261,000
Net unrealized gains			$ 167,000	$ 1,141,000
Transfers of investments between Level 1 and Level 2	0	0	0	0
Estimated interest accrued		399,000		399,000
Impairment loss recognized on an asset group			0	0
Time for the collection of cost associated with Pre- contract			1 year
Valuation allowance	0	0	0	0
Separate U.S. Corporate Entities Affiliated With A Foreign-Based Global Company [Member] | Revenue [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration	5.00%	4.00%	16.00%	11.00%
Three to Four Years Old Inventory [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cost basis reduction in inventory, percentage	50.00%		50.00%
Three to Four Years Old Inventory [Member] | Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory, time period on the shelf, years			3 years
Three to Four Years Old Inventory [Member] | Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory, time period on the shelf, years			4 years
Four to Five Years Old Inventory [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cost basis reduction in inventory, percentage	75.00%		75.00%
Four to Five Years Old Inventory [Member] | Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory, time period on the shelf, years			4 years
Four to Five Years Old Inventory [Member] | Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory, time period on the shelf, years			5 years
Greater Than Five Years Old Inventory [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory valuation estimate	$ 0		$ 0
Greater Than Five Years Old Inventory [Member] | Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Inventory, time period on the shelf, years			5 years