Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Notional amount of foreign currency derivative contract) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Derivative, Notional Amount	$ 157,255	$ 116,988
Switzerland, Francs
Derivative [Line Items]
Derivative, Notional Amount	5,149	1,200
Foreign Exchange Forward [Member] | Canada, Dollars
Derivative [Line Items]
Derivative, Notional Amount	17,448	25,583
Foreign Exchange Forward [Member] | Euro Member Countries, Euro
Derivative [Line Items]
Derivative, Notional Amount	82,917	61,751
Foreign Exchange Forward [Member] | United Kingdom, Pounds
Derivative [Line Items]
Derivative, Notional Amount	9,409	14,259
Foreign Exchange Forward [Member] | Israel, New Shekels
Derivative [Line Items]
Derivative, Notional Amount	4,607	6,144
Foreign Exchange Forward [Member] | Japan, Yen
Derivative [Line Items]
Derivative, Notional Amount	25,133	0
Foreign Exchange Forward [Member] | All Other [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 12,592	$ 8,051