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Fair Value Measurements (Schedule of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Financial assets:      
Cash equivalents $ 108,020 $ 93,058  
Available-for-sale Securities 57,435 55,951  
Forward contracts 3,064 2,889  
Financial assets 168,519 151,898  
Financial liabilities:      
Contingent consideration 0 1,575 $ 8,400
Forward contracts 2,771 3,419  
Financial liabilities 2,771 4,994  
Level 1      
Financial assets:      
Cash equivalents 108,020 93,058  
Forward contracts 0 0  
Financial assets 164,456 147,795  
Financial liabilities:      
Contingent consideration   0  
Forward contracts 0 0  
Financial liabilities 0 0  
Level 2      
Financial assets:      
Cash equivalents 0 0  
Forward contracts 3,064 2,889  
Financial assets 4,063 4,103  
Financial liabilities:      
Contingent consideration   0  
Forward contracts 2,771 3,419  
Financial liabilities 2,771 3,419  
Level 3      
Financial assets:      
Cash equivalents 0 0  
Forward contracts 0 0  
Financial assets 0 0  
Financial liabilities:      
Contingent consideration   1,575  
Forward contracts 0 0  
Financial liabilities 0 1,575  
Certificates of Deposit [Member]      
Financial assets:      
Available-for-sale Securities   219  
Certificates of Deposit [Member] | Level 1      
Financial assets:      
Available-for-sale Securities   0  
Certificates of Deposit [Member] | Level 2      
Financial assets:      
Available-for-sale Securities   219  
Certificates of Deposit [Member] | Level 3      
Financial assets:      
Available-for-sale Securities   0  
Commercial Paper [Member]      
Financial assets:      
Available-for-sale Securities 999    
Commercial Paper [Member] | Level 1      
Financial assets:      
Available-for-sale Securities 0    
Commercial Paper [Member] | Level 2      
Financial assets:      
Available-for-sale Securities 999    
Commercial Paper [Member] | Level 3      
Financial assets:      
Available-for-sale Securities 0    
Corporate notes/bonds [Member]      
Financial assets:      
Available-for-sale Securities 56,436 54,737  
Corporate notes/bonds [Member] | Level 1      
Financial assets:      
Available-for-sale Securities 56,436 54,737  
Corporate notes/bonds [Member] | Level 2      
Financial assets:      
Available-for-sale Securities 0 0  
Corporate notes/bonds [Member] | Level 3      
Financial assets:      
Available-for-sale Securities $ 0 0  
US Government Agencies Securities [Member]      
Financial assets:      
Available-for-sale Securities   995  
US Government Agencies Securities [Member] | Level 1      
Financial assets:      
Available-for-sale Securities   0  
US Government Agencies Securities [Member] | Level 2      
Financial assets:      
Available-for-sale Securities   995  
US Government Agencies Securities [Member] | Level 3      
Financial assets:      
Available-for-sale Securities   $ 0