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Stockholders' Equity (Tables)
 12 Months Ended
Oct. 31, 2017
Stock Repurchase Program [Abstract]  
Stock repurchase program
The following table provides information about the share repurchase programs for the fiscal years ended October 31, 2017, 2016, and 2015:
 
2017
 
2016
 
2015
Number of shares purchased (in thousands)
7,694

 
13,652

 
1,665

Average price per share
$
37.81

 
$
28.77

 
$
34.17

Remaining authorization at October 31 (in thousands)
8,144

 
15,838

 
18,535