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Income Taxes (Tables)
9 Months Ended
Jul. 31, 2020
Income Tax Disclosure [Abstract]  
Provision (Benefit) for Incomes Taxes and Effective Tax Rates
The following table presents the provision (benefit) for income taxes and the effective tax rates:
 
Three Months Ended 
 July 31,
 
Nine Months Ended 
 July 31,
 
2020
 
2019
 
2020
 
2019
 
(in thousands)
Income before income taxes
$
236,854

 
$
132,911

 
$
446,593

 
$
413,883

Provision (benefit) for income taxes
$
(16,057
)
 
$
32,982

 
$
(20,299
)
 
$
42,230

Effective tax rate
(6.8
)%
 
24.8
%
 
(4.5
)%
 
10.2
%