XML 83 R67.htm IDEA: XBRL DOCUMENT v3.8.0.1
Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis $ 36,788 [1] $ 61,928 [2]
Available-for-sale securities, unrealized gains 4 49
Available-for-sale securities, unrealized losses (24) (54)
Available-for-sale marketable securities, fair value 36,768 [1] 61,923 [2]
Purchased and accrued interest 211 271
Current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 32,031 58,423
Available-for-sale securities, unrealized gains 4 13
Available-for-sale securities, unrealized losses (20) (54)
Available-for-sale marketable securities, fair value 32,015 58,382
Current Assets | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 28,275 28,801
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (20) (34)
Available-for-sale marketable securities, fair value 28,255 28,767
Current Assets | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis   23,963
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   (20)
Available-for-sale marketable securities, fair value   23,943
Current Assets | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 3,756 3,755
Available-for-sale securities, unrealized gains 4 13
Available-for-sale securities, unrealized losses 0 0
Available-for-sale marketable securities, fair value 3,760 3,768
Current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis   1,904
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   0
Available-for-sale marketable securities, fair value   1,904
Non-current Assets | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 4,757 3,505
Available-for-sale securities, unrealized gains 0 36
Available-for-sale securities, unrealized losses (4) 0
Available-for-sale marketable securities, fair value $ 4,753 $ 3,541
[1] Included in amortized cost and fair value is purchased and accrued interest of $211.
[2] Included in amortized cost and fair value is purchased and accrued interest of $271