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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
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
 
December 30, 2017
 
September 30, 2017
 
December 30, 2017
 
September 30, 2017
Euro currency hedge contracts
 

 
 

 
 

 
 

Purchase
$
116,372

 
$
109,641

 
$
(669
)
 
$
(1,397
)
Sell
$
(33,588
)
 
$
—

 
$
(44
)
 
$
—

 
 
 
 
 
 
 
 
Japanese Yen currency hedge contracts
 
 
 
 
 
 
 
Sell
$
(10,818
)
 
$
(25,126
)
 
$
224

 
$
591

 
 
 
 
 
 
 
 
South Korean Won currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
29,580

 
$
—

 
$
362

 
$
—

  Sell
$
(49,721
)
 
$
(28,996
)
 
$
(140
)
 
$
551

 
 
 
 
 
 
 
 
Chinese RMB currency hedge contracts
 
 
 
 
 
 
 
Sell
$
(15,138
)
 
$
(13,744
)
 
$
(97
)
 
$
128

 
 
 
 
 
 
 
 
Other foreign currency hedge contracts
 

 
 

 
 

 
 

Purchase
$
9,562

 
$
3,668

 
$
2

 
$
(4
)
Sell
$
(2,077
)
 
$
(2,971
)
 
$
(12
)
 
$
(74
)