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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis $ 61,928 [1] $ 60,869 [2]
Available-for-sale securities, unrealized gains 49 10
Available-for-sale securities, unrealized losses (54) (62)
Available-for-sale marketable securities, fair value 61,923 [1] 60,817 [2]
Purchased and accrued interest 271 252
Current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 58,423 47,224
Available-for-sale securities, unrealized gains 13 8
Available-for-sale securities, unrealized losses (54) (41)
Available-for-sale marketable securities, fair value 58,382 47,191
Current Assets | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 28,801 31,753
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (34) (39)
Available-for-sale marketable securities, fair value 28,767 31,714
Current Assets | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 23,963 7,986
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (20) (1)
Available-for-sale marketable securities, fair value 23,943 7,985
Current Assets | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 3,755 6,253
Available-for-sale securities, unrealized gains 13 8
Available-for-sale securities, unrealized losses 0 0
Available-for-sale marketable securities, fair value 3,768 6,261
Current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 1,904 1,232
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses 0 (1)
Available-for-sale marketable securities, fair value 1,904 1,231
Non-current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis   13,645
Available-for-sale securities, unrealized gains   2
Available-for-sale securities, unrealized losses   (21)
Available-for-sale marketable securities, fair value   13,626
Non-current Assets | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis   4,138
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   (12)
Available-for-sale marketable securities, fair value   4,126
Non-current Assets | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 3,505 7,511
Available-for-sale securities, unrealized gains 36 2
Available-for-sale securities, unrealized losses 0 (6)
Available-for-sale marketable securities, fair value $ 3,541 7,507
Non-current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis   1,996
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   (3)
Available-for-sale marketable securities, fair value   $ 1,993
[1] Included in amortized cost and fair value is purchased and accrued interest of $271.
[2] Included in amortized cost and fair value is purchased and accrued interest of $252