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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis $ 55,244 [1] $ 61,928 [2]
Available-for-sale securities, unrealized gains 22 49
Available-for-sale securities, unrealized losses (52) (54)
Available-for-sale marketable securities, fair value 55,214 [1] 61,923 [2]
Purchased and accrued interest 282 271
Current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 51,984 [1] 58,423 [2]
Available-for-sale securities, unrealized gains 7 13
Available-for-sale securities, unrealized losses (52) (54)
Available-for-sale marketable securities, fair value 51,939 [1] 58,382 [2]
Current Assets | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 33,979 [1] 28,801 [2]
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (50) (34)
Available-for-sale marketable securities, fair value 33,929 [1] 28,767 [2]
Current Assets | Commercial Paper    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 13,990 [1] 23,963 [2]
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (2) (20)
Available-for-sale marketable securities, fair value 13,988 [1] 23,943 [2]
Current Assets | Certificates of Deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 4,015 [1] 3,755 [2]
Available-for-sale securities, unrealized gains 7 13
Available-for-sale securities, unrealized losses 0 0
Available-for-sale marketable securities, fair value 4,022 [1] 3,768 [2]
Current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis [2]   1,904
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   0
Available-for-sale marketable securities, fair value [2]   1,904
Non-current Assets | Certificates of Deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 3,260 [1] 3,505 [2]
Available-for-sale securities, unrealized gains 15 36
Available-for-sale securities, unrealized losses 0 0
Available-for-sale marketable securities, fair value $ 3,275 [1] $ 3,541 [2]
[1] Included in amortized cost and fair value is purchased and accrued interest of $282
[2] Included in amortized cost and fair value is purchased and accrued interest of $271.