Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to Cooper stockholders	$ 88,600	$ 103,600	$ 104,900	$ 75,800	$ 60,500	$ 87,900	$ 74,100	$ 51,400	$ 372,900	$ 273,900	$ 203,500
Weighted average common shares									48.9	48.5	48.5
Basic earnings per share attributable to Cooper stockholders	$ 1.82	$ 2.12	$ 2.14	$ 1.55	$ 1.25	$ 1.81	$ 1.53	$ 1.06	$ 7.63	$ 5.65	$ 4.20
Effect of dilutive stock options									0.7	0.5	0.7
Diluted weighted average common shares									49.6	49.0	49.2
Diluted earnings per share attributable to Cooper stockholders	$ 1.78	$ 2.09	$ 2.12	$ 1.53	$ 1.23	$ 1.79	$ 1.52	$ 1.05	$ 7.52	$ 5.59	$ 4.14