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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Jun. 30, 2018
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
 
June 30, 2018
 
September 30, 2017
 
June 30, 2018
 
September 30, 2017
Euro currency hedge contracts
 

 
 

 
 

 
 

Purchase
$
122,343

 
$
109,641

 
$
(359
)
 
$
(1,397
)
  Sell
$
(5,492
)
 
$
—

 
$
72

 
$
—

 
 
 
 
 
 
 
 
Japanese Yen currency hedge contracts
 
 
 
 
 
 
 
Sell
$
(24,052
)
 
$
(25,126
)
 
$
459

 
$
591

 
 
 
 
 
 
 
 
South Korean Won currency hedge contracts
 
 
 
 
 
 
 
  Sell
$
(36,772
)
 
$
(28,996
)
 
$
1,204

 
$
551

 
 
 
 
 
 
 
 
Chinese RMB currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
6,589

 
$
—

 
$
(222
)
 
$
—

Sell
$
(49,399
)
 
$
(13,744
)
 
$
1,415

 
$
128

 
 
 
 
 
 
 
 
Singapore Dollar currency hedge contracts
 
 
 
 
 
 
 
Purchase
$
33,351

 
$
3,668

 
$
(598
)
 
$
(4
)
 
 
 
 
 
 
 
 
Other foreign currency hedge contracts
 

 
 

 
 

 
 

Purchase
$
2,783

 
$
—

 
$
(34
)
 
$
—

Sell
$
(3,508
)
 
$
(2,971
)
 
$
41

 
$
(74
)