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Stockholders' Equity (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Aug. 06, 2014
Feb. 07, 2014
Aug. 06, 2013
Feb. 07, 2013
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Dec. 15, 2011
Equity [Abstract]                        
Share repurchase program, maximum amount authorized                       $ 500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of shares purchased         176,000us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 396,000us-gaap_TreasuryStockSharesAcquired 571,939us-gaap_TreasuryStockSharesAcquired 1,420,728us-gaap_TreasuryStockSharesAcquired 984,027us-gaap_TreasuryStockSharesAcquired  
Cost of common stock repurchased         25,800,000us-gaap_TreasuryStockValueAcquiredCostMethod     50,000,000us-gaap_TreasuryStockValueAcquiredCostMethod 75,778,000us-gaap_TreasuryStockValueAcquiredCostMethod 167,334,000us-gaap_TreasuryStockValueAcquiredCostMethod 71,150,000us-gaap_TreasuryStockValueAcquiredCostMethod  
Share repurchase program, remaining authorized amount         185,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1       185,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1      
Average purchase price per share (usd per share)         $ 146.64us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare     $ 126.21us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare        
Dividends on common stock 1,500,000us-gaap_PaymentsOfDividendsCommonStock 1,400,000us-gaap_PaymentsOfDividendsCommonStock 1,500,000us-gaap_PaymentsOfDividendsCommonStock 1,400,000us-gaap_PaymentsOfDividendsCommonStock         2,884,000us-gaap_PaymentsOfDividendsCommonStock 2,918,000us-gaap_PaymentsOfDividendsCommonStock 2,857,000us-gaap_PaymentsOfDividendsCommonStock  
Cash dividend, per share (usd per share) $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid         $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid      
Date of record Jul. 24, 2014 Jan. 24, 2014 Jul. 24, 2013 Jan. 25, 2013                
Common stock purchase right versus preferred share purchase right                 0.5coo_CommonStockPurchaseRightVersusPreferredSharePurchaseRight      
Percentage of acquisition of beneficial ownership                 20.00%coo_MinimumPercentageOfCommonStockToBeAcquiredInOrderToExerciseSharePurchaseRights      
Purchase price of the Right, subject to adjustment (usd per right)                 $ 450us-gaap_PaymentsForRepurchaseOfOtherEquity      
Percentage of assets or earning power sold                 50.00%coo_PercentageOfCommonStockSharesMergedOrAssetsOrEarningPowerSold      
Board of Directors may redeem the rights at, price per right         $ 0.01us-gaap_SaleOfStockPricePerShare       $ 0.01us-gaap_SaleOfStockPricePerShare