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Composition of Certain Financial Statement Captions (Tables)
 6 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Property and Equipment
The following table summarizes property and equipment, and the related accumulated depreciation and amortization, at March 31, 2017 and September 30, 2016: 
 
March 31,
2017
 
September 30,
2016
 
(In thousands)
Property and equipment
$
127,721

 
$
126,760

Less: accumulated depreciation and amortization
(84,993
)
 
(81,638
)
 
$
42,728

 
$
45,122