Earnings Per Share (Schedule of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Earnings Per Share [Abstract]
Net income attributable to Cooper stockholders	$ 71,920	$ 66,875	$ 54,921	$ 54,623	$ 56,638	$ 44,217	$ 35,360	$ 39,215	$ 248,339	$ 175,430	$ 112,803
Basic, Weighted average common shares									47,913	46,904	45,530
Basic earnings per share attributable to Cooper stockholders (in dollars per share)	$ 1.49	$ 1.39	$ 1.15	$ 1.15	$ 1.19	$ 0.93	$ 0.76	$ 0.85	$ 5.18	$ 3.74	$ 2.48
Effect of dilutive stock options									1,239	1,405	975
Diluted weighted average common shares									49,152	48,309	46,505
Diluted earnings per common share attributable to Cooper stockholders (in dollars per share)	$ 1.46	$ 1.36	$ 1.12	$ 1.12	$ 1.15	$ 0.90	$ 0.73	$ 0.83	$ 5.05	$ 3.63	$ 2.43