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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Exercisable stock options, included in the diluted earnings per share calculation           337,000
Effect of dilutive stock options         0 72,000
Anti-dilutive exercisable stock options, not included in the diluted earnings per share calculation         341,000 8,000
Net unrealized gains (losses) $ (4,882,000) $ 167,000        
Transfers of investments between Level 1 and Level 2 0 0 $ 0 $ 0 $ 0 $ 0
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 $ 0 $ 0
Entities Owned by One Global Company [Member] | Revenue [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Percentage of concentration     34.00% 5.00% 15.00% 16.00%
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%  
Inventory, minimum time period on the shelf, years         3 years  
Inventory, maximum 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%  
Inventory, minimum time period on the shelf, years         4 years  
Inventory, maximum 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, minimum time period on the shelf, years         5 years  
Inventory valuation estimate         $ 0