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Derivative Financial Instruments (Tables)
12 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Notional Amounts of Derivative Instruments
The table below presents the total volume or notional amounts of the Company’s derivative instruments as of September 30, 2021. Notional values are in U.S. dollars and are translated and calculated based on forward rates as of September 30, 2021 for forward contracts, and based on spot rates as of September 30, 2021 for options.
 
    
Notional Value*
 
Foreign exchange contracts
   $ 1,260,450  
 
(*)
Gross notional amounts do not quantify risk or represent assets or liabilities of the Company but are used in the calculation of settlements under the contracts.
Fair Value of Open Foreign Currency Exchange Contracts
The Company records all derivative instruments on the balance sheet at fair value. For further information, please see Note 5 to the consolidated financial statements. The fair value of the open foreign exchange contracts recorded as an asset or a liability by the Company on its consolidated balance sheets as of September 30, 2021 and September 30, 2020, is as follows:
 
    
As of September 30,
 
    
2021
    
2020
 
Derivatives designated as hedging instruments
                 
Prepaid expenses and other current assets
   $ 6,962      $ 21,153  
Other noncurrent assets
     3,068        1,317  
Accrued expenses and other current liabilities
     (70      (2,089
    
 
 
    
 
 
 
       9,960        20,381  
Derivatives not designated as hedging instruments
                 
Prepaid expenses and other current assets
     4,230        3,068  
Accrued expenses and other current liabilities
     (3,211      (2,813
    
 
 
    
 
 
 
       1,019        255  
    
 
 
    
 
 
 
Net fair value
   $ 10,979      $ 20,636  
    
 
 
    
 
 
 
Effect of Cash Flow Hedging Instruments
The effect of the Company’s cash flow hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2021, 2020 and 2019, respectively, which partially offsets the foreign currency impact from the underlying exposures, is summarized as follows:
 
    
Gains (Losses) Reclassified from

Accumulated Other Comprehensive Income (Loss)

(Effective Portion)

Year Ended September 30,
 
    
        2021      
    
      2020      
    
      2019      
 
Line item in consolidated statements of income:
                          
Revenue
   $ (473    $ 834      $ 19  
Cost of revenue
     20,209        4,166        (8,627
Research and development
     6,069        1,646        (2,059
Selling, general and administrative
     6,347        2,500        (2,309
    
 
 
    
 
 
    
 
 
 
Total
   $ 32,152      $ 9,146      $ (12,976
    
 
 
    
 
 
    
 
 
 
Changes in Net Unrealized Gains (Losses) on Cash Flow Hedges
The activity related to the changes in net unrealized gains (losses) on cash flow hedges recorded in accumulated other comprehensive income (loss), net of tax, is as follows:
 
    
Year Ended September 30,
 
    
2021
    
2020
    
2019
 
Net unrealized gain (loss) on cash flow hedges, net of tax, beginning of period
   $ 18,836      $ 3,945      $ (26,608
Changes in fair value of cash flow hedges, net of tax
     24,239        21,903        19,228  
Reclassification of (gain) loss into earnings, net of tax
     (29,302      (7,012      11,325  
    
 
 
    
 
 
    
 
 
 
Net unrealized gain (loss) on cash flow hedges, net of tax, end of period
   $ 13,773      $ 18,836      $ 3,945  
    
 
 
    
 
 
    
 
 
 
Effect of Non-Designated as Hedging Instruments
The effect of the Company’s derivative instruments not designated as hedging instruments in the consolidated statements of income for the fiscal years ended September 30, 2021, 2020 and 2019, respectively, which partially offsets the foreign currency impact from the underlying exposure, is summarized as follows:
 
    
Gains (Losses)
Recognized in Income
Year Ended September 30,
 
    
2021
    
2020
    
2019
 
Line item in statements of income:
                          
Cost of revenue
   $ 4,786      $ (718    $ 401  
Research and development
     1,187        (341      14  
Selling, general and administrative
     1,301        (559      294  
Interest and other expense, net
     1,808        255        5,845  
Income taxes
     (3,125      (679      (528
    
 
 
    
 
 
    
 
 
 
Total
   $ 5,957      $ (2,042    $ 6,026