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Derivative Financial Instruments (Derivative Instruments and Hedging Activities Disclosures) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI-Effective Portion $ (2,046) $ (515) $ (2,959) $ 2,522
Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI-Effective Portion (2,339) (589) (3,382) 2,882
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 (1,728) 567 (2,382) 974
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) (2,435) (238) (3,022) 8,091
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 $ (16) $ (4) $ (35) $ 5