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Composition of Certain Financial Statement Captions (Tables)
 3 Months Ended
Dec. 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 December 31, 2017 and September 30, 2017:
 
December 31,
2017
 
September 30,
2017
 
(In thousands)
Property and equipment
$
139,344

 
$
135,360

Less: accumulated depreciation and amortization
(100,536
)
 
(94,657
)
 
$
38,808

 
$
40,703