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Stock Repurchase Program and Cash Dividend (Tables)
 6 Months Ended
Apr. 30, 2018
Stock Repurchase Program [Abstract]  
Stock repurchase program
The table below provides, for the periods indicated, information about our share repurchase programs:
 
Six months ended April 30,
 
Three months ended April 30,
 
2018
 
2017
 
2018
 
2017
Number of shares purchased (in thousands)
6,221

 
563

 
1,794

 
5

Average price per share
$
46.86

 
$
27.41

 
$
45.44

 
$
35.57

Remaining authorization at April 30 (in thousands)
16,876

 
15,276

 
16,876

 
15,276