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Derivative Financial Instruments (Derivative Instruments and Hedging Activities Disclosures) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI-Effective Portion $ 3,910 $ (2,298) $ 950 $ 224
Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI-Effective Portion 4,468 (2,627) 1,086 256
Forward Contracts | Subscription, support and license revenue | Designated as Hedging Instrument | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Reclassified from OCI into Income-Effective Portion (277) (86) (2,659) 888
Forward Contracts | Interest income and other expense, net | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) 9,392 (6,669) 6,370 1,422
Forward Contracts | Interest income and other expense, net | Designated as Hedging Instrument | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized-Ineffective Portion $ 52 $ (29) $ 17 $ (23)