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Geographic Information (Tables)
3 Months Ended
Jan. 31, 2018
Geographic Information Disclosure Table [Abstract]  
Summary of revenue and long-lived assets by principal georgraphic areas
  Three Months Ended
  January 31,
 (in thousands) 2018 2017
 Revenue:    
  U.S.$ 404,399$ 340,560
  International  17,013  14,399
  Total$ 421,412$ 354,959

   January 31, October 31,
 (in thousands) 2018 2017
 Long-lived Assets:    
  U.S.$ 47,235$ 46,804
  International  2,457  2,185
  Total$ 49,692$ 48,989