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Summary Of Significant Accounting Policies (Schedule of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Financial assets:      
Cash equivalents [1] $ 49,845 $ 60,139  
Available-for-sale Securities 50,315 49,616  
Forward contracts 1,163 260  
Financial assets 101,323 110,015  
Financial liabilities:      
Contingent consideration 8,400 19,570 $ 13,000
Forward contracts 4,347 3,170  
Financial liabilities 12,747 22,740  
Level 1 [Member]      
Financial assets:      
Cash equivalents [1] 49,845 60,139  
Forward contracts 0 0  
Financial assets 97,518 94,740  
Financial liabilities:      
Contingent consideration 0 0  
Forward contracts 0 0  
Financial liabilities 0 0  
Level 2 [Member]      
Financial assets:      
Cash equivalents 0 0  
Forward contracts 1,163 260  
Financial assets 3,805 15,275  
Financial liabilities:      
Contingent consideration 0 0  
Forward contracts 4,347 3,170  
Financial liabilities 4,347 3,170  
Level 3 [Member]      
Financial assets:      
Cash equivalents 0 0  
Forward contracts 0 0  
Financial assets 0 0  
Financial liabilities:      
Contingent consideration 8,400 19,570  
Forward contracts 0 0  
Financial liabilities 8,400 19,570  
Certificates of Deposit [Member]      
Financial assets:      
Available-for-sale Securities 240 681  
Certificates of Deposit [Member] | Level 1 [Member]      
Financial assets:      
Available-for-sale Securities 0 0  
Certificates of Deposit [Member] | Level 2 [Member]      
Financial assets:      
Available-for-sale Securities 240 681  
Certificates of Deposit [Member] | Level 3 [Member]      
Financial assets:      
Available-for-sale Securities 0 0  
Commercial Paper [Member]      
Financial assets:      
Available-for-sale Securities   11,925  
Commercial Paper [Member] | Level 1 [Member]      
Financial assets:      
Available-for-sale Securities   0  
Commercial Paper [Member] | Level 2 [Member]      
Financial assets:      
Available-for-sale Securities   11,925  
Commercial Paper [Member] | Level 3 [Member]      
Financial assets:      
Available-for-sale Securities   0  
Corporate notes/bonds [Member]      
Financial assets:      
Available-for-sale Securities 47,673 34,601  
Corporate notes/bonds [Member] | Level 1 [Member]      
Financial assets:      
Available-for-sale Securities 47,673 34,601  
Corporate notes/bonds [Member] | Level 2 [Member]      
Financial assets:      
Available-for-sale Securities 0 0  
Corporate notes/bonds [Member] | Level 3 [Member]      
Financial assets:      
Available-for-sale Securities 0 0  
US Government Agencies Securities [Member]      
Financial assets:      
Available-for-sale Securities 2,402 2,409  
US Government Agencies Securities [Member] | Level 1 [Member]      
Financial assets:      
Available-for-sale Securities 0 0  
US Government Agencies Securities [Member] | Level 2 [Member]      
Financial assets:      
Available-for-sale Securities 2,402 2,409  
US Government Agencies Securities [Member] | Level 3 [Member]      
Financial assets:      
Available-for-sale Securities $ 0 $ 0  
[1] Money market funds and time deposits.