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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis $ 70,468 [1] $ 60,869 [2]
Available-for-sale securities, unrealized gains 47 10
Available-for-sale securities, unrealized losses (57) (62)
Available-for-sale marketable securities, fair value 70,458 [1] 60,817 [2]
Purchased and accrued interest 282 252
Current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 63,193 [1] 47,224 [2]
Available-for-sale securities, unrealized gains 1 8
Available-for-sale securities, unrealized losses (57) (41)
Available-for-sale marketable securities, fair value 63,137 [1] 47,191 [2]
Current Assets | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 34,116 [1] 31,753 [2]
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (43) (39)
Available-for-sale marketable securities, fair value 34,073 [1] 31,714 [2]
Current Assets | Commercial Paper    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 23,966 [1] 7,986 [2]
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (12) (1)
Available-for-sale marketable securities, fair value 23,954 [1] 7,985 [2]
Current Assets | Certificates of Deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 2,005 [1] 6,253 [2]
Available-for-sale securities, unrealized gains 1 8
Available-for-sale securities, unrealized losses 0 0
Available-for-sale marketable securities, fair value 2,006 [1] 6,261 [2]
Current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 3,106 [1] 1,232 [2]
Available-for-sale securities, unrealized gains 0 0
Available-for-sale securities, unrealized losses (2) (1)
Available-for-sale marketable securities, fair value 3,104 [1] 1,231 [2]
Non-current Assets    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis [2]   13,645
Available-for-sale securities, unrealized gains   2
Available-for-sale securities, unrealized losses   (21)
Available-for-sale marketable securities, fair value [2]   13,626
Non-current Assets | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis [2]   4,138
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   (12)
Available-for-sale marketable securities, fair value [2]   4,126
Non-current Assets | Certificates of Deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis 7,275 [1] 7,511 [2]
Available-for-sale securities, unrealized gains 46 2
Available-for-sale securities, unrealized losses 0 (6)
Available-for-sale marketable securities, fair value $ 7,321 [1] 7,507 [2]
Non-current Assets | Government municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, amortized cost basis [2]   1,996
Available-for-sale securities, unrealized gains   0
Available-for-sale securities, unrealized losses   (3)
Available-for-sale marketable securities, fair value [2]   $ 1,993
[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 $252.