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Composition of Certain Financial Statement Captions (Tables)
 9 Months Ended
Jun. 30, 2018
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 June 30, 2018 and September 30, 2017:
 
June 30,
2018
 
September 30,
2017
 
(In thousands)
Property and equipment
$
159,534

 
$
135,360

Less: accumulated depreciation and amortization
(108,017
)
 
(94,657
)
 
$
51,517

 
$
40,703