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Investments (Tables)
 3 Months Ended
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]  
Amortized Cost, Unrealized Holding Gains and (Losses) and Fair Value of Available-for-sale Securities

The amortized cost, unrealized holding gains and losses, and fair value of available-for-sale securities were as follows:

 

 

 

December 31, 2018

 

(Dollars in thousands)

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

Short-term commercial paper and corporate bonds

 

$

31,501

 

 

$

—

 

 

$

(48

)

 

$

31,453

 

Total

 

$

31,501

 

 

$

—

 

 

$

(48

)

 

$

31,453

 

 

 

 

September 30, 2018

 

(Dollars in thousands)

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

Short-term commercial paper and corporate bonds

 

$

41,403

 

 

$

—

 

 

$

(51

)

 

$

41,352

 

Total

 

$

41,403

 

 

$

—

 

 

$

(51

)

 

$

41,352