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Intangible Assets (Tables)
 9 Months Ended
Jun. 30, 2015
Intangible Assets [Abstract]  
Schedule of Carrying Value of Intangible Assets
The following table sets forth the carrying value of intangible assets:

(in thousands)
 
As of June 30, 2015
 
As of September 30, 2014
 
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
 
Gross Assets
 
Accumulated
Amortization
 
Net
Assets
Fiber Optics:
 
 
 
 
 
 
 
 
 
 
 
 
   Patents
 
3,274

 
(3,211
)
 
63

 
4,697

 
(4,615
)
 
82

Total
 
$
3,274

 
$
(3,211
)
 
$
63

 
$
4,697

 
$
(4,615
)
 
$
82