Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Preferred stock
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, authorized (in shares)	175,000,000	175,000,000
Common stock, issued (in shares)	106,882,972	108,427,393
Common stock, outstanding (in shares)	106,882,972	108,427,393
Customers, allowance for doubtful accounts (in dollars)	$ 2,147	$ 1,609
Voting Preferred Stock
Preferred stock
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Nonvoting Preferred Stock
Preferred stock
Preferred stock, authorized (in shares)	850,000	850,000