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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of outstanding notional contract and fair value amount of hedge contracts
The outstanding notional contract and fair value asset (liability) amounts of non-designated hedge contracts, with maximum maturity of two months, are as follows (in thousands):
 
U.S. Notional Contract Value
 
U.S. Fair Value
 
September 30, 2017
 
October 1, 2016
 
September 30, 2017
 
October 1, 2016
Euro currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
109,641

 
$
91,108

 
$
(1,397
)
 
$
162

Sell
$
—

 
$
(750,454
)
 
$
—

 
$
(2,234
)
 
 
 
 
 
 
 
 
South Korean Won currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
—

 
$
31,248

 
$
—

 
$
413

Sell
$
(28,996
)
 
$
(37,929
)
 
$
551

 
$
(152
)
 
 
 
 
 
 
 
 
Chinese RMB currency hedge contracts
 
 
 
 
 
 
 
Sell
$
(13,744
)
 
$
(25,237
)
 
$
128

 
$
(91
)
 
 
 
 
 
 
 
 
Japanese Yen currency hedge contracts
 
 
 
 
 
 
 
Sell
$
(25,126
)
 
$
(36,450
)
 
$
591

 
$
(343
)
 
 
 
 
 
 
 
 
Other foreign currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
3,668

 
$
6,033

 
$
(4
)
 
$
(4
)
Sell
$
(2,971
)
 
$
(1,775
)
 
$
(74
)
 
$
38