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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured at Fair Value on a Recurring Basis
The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at March 31, 2018, were as follows (in thousands):
 
 
 
Fair Value Measurements at Reporting Date Using
 
 
 
 
Quoted Prices in
Active Markets for
Identical Securities
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value at
March 31,
2018
Cash equivalents
 
$
14,622

 
$
11,804

 
$

 
$
26,426

Short-term investments
 
 
 
 
 
 
 
 
Available-for-sale securities — corporate bonds and notes
 

 
199,143

 

 
199,143

Available-for-sale securities — municipal bonds and notes
 

 
62,593

 

 
62,593

Available-for-sale securities — U.S. government securities
 

 
106,456

 

 
106,456

Available-for-sale securities — U.S. government agency securities
 

 
60,564

 

 
60,564

Long-term investments
 
 
 
 
 
 
 
 
Available-for-sale securities — corporate bonds and notes
 

 
280,612

 

 
280,612

Available-for-sale securities — municipal bonds and notes
 

 
29,640

 

 
29,640

Available-for-sale securities — U.S. government securities
 

 
20,688

 

 
20,688

Available-for-sale securities — U.S. government agency securities
 

 
19,301

 

 
19,301

Total
 
$
14,622

 
$
790,801

 
$

 
$
805,423


The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2017, were as follows (in thousands):
 
 
 
Fair Value Measurements at Reporting Date Using
 
 
 
 
Quoted Prices in
Active Markets for
Identical Securities
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value at
September 30,
2017
Cash equivalents
 
$
13,967

 
$
3,192

 
$

 
$
17,159

Short-term investments
 
 
 
 
 
 
 
 
Available-for-sale securities — corporate bonds and notes
 

 
172,493

 

 
172,493

Available-for-sale securities — municipal bonds and notes
 

 
67,409

 

 
67,409

Available-for-sale securities — U.S. government securities
 

 
72,930

 

 
72,930

Available-for-sale securities — U.S. government agency securities
 

 
30,868

 

 
30,868

Long-term investments
 
 
 
 
 
 
 
 
Available-for-sale securities — corporate bonds and notes
 

 
191,782

 

 
191,782

Available-for-sale securities — municipal bonds and notes
 

 
26,643

 

 
26,643

Available-for-sale securities — U.S. government securities
 

 
29,374

 

 
29,374

Available-for-sale securities — U.S. government agency securities
 

 
37,003

 

 
37,003

Total
 
$
13,967

 
$
631,694

 
$

 
$
645,661