(Loss) Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Cooper stockholders	$ 60,900	$ 104,900	$ (61,600)	$ 180,700
Basic:
Weighted average common shares	49,100	49,000	49,000	48,900
Basic earnings (loss) per common share attributable to Cooper stockholders	$ 1.24	$ 2.14	$ (1.26)	$ 3.70
Diluted:
Effect of potential dilutive common shares	500	500	0	600
Diluted weighted average common shares	49,600	49,500	49,000	49,500
Diluted earnings (loss) per common share attributable to Cooper stockholders	$ 1.23	$ 2.12	$ (1.26)	$ 3.65