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Cash, Cash Equivalents and Marketable Securities Available for Sale (Tables)
12 Months Ended
Sep. 30, 2017
Cash and Cash Equivalents [Abstract]  
Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale
The following is a summary of cash, cash equivalents and marketable securities available for sale at September 30, 2017 and 2016: 
 
September 30, 2017
 
September 30, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Fair Value
 
(In thousands)
Cash and Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
Cash
$
90,323

 
$

 
$
90,323

 
$
75,486

 
$

 
$
75,486

Money market funds
6,471

 

 
6,471

 
440

 

 
440

Bank time deposits
8,824

 

 
8,824

 

 

 

Total
$
105,618

 
$

 
$
105,618

 
$
75,926

 
$

 
$
75,926

Long-term Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
10,788

 
$
3,003

 
$
13,791

 
$
9,598

 
$
1,418

 
$
11,016