Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 100,800	$ 103,600	$ 39,200	$ 284,300
Basic:
Weighted average shares	49,100	48,900	49,000	48,900
Earnings per share - basic	$ 2.05	$ 2.12	$ 0.80	$ 5.81
Diluted:
Effect of potential dilutive shares	600	700	600	600
Diluted weighted average shares	49,700	49,600	49,600	49,500
Earnings per share - diluted	$ 2.03	$ 2.09	$ 0.79	$ 5.74