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Stock Issuance and Stock Repurchase Program (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2013
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Dec. 16, 2014
Nov. 07, 2013
Mar. 31, 2003
Share Repurchase Program                
Number of shares purchased   10us-gaap_TreasuryStockSharesAcquired 3us-gaap_TreasuryStockSharesAcquired 211us-gaap_TreasuryStockSharesAcquired 5us-gaap_TreasuryStockSharesAcquired      
Average price per share   $ 37.83us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 36.04us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 31.40us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 34.71us-gaap_TreasuryStockAcquiredAverageCostPerShare      
Remaining authorization at April 30:   19,989us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 8,263us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 19,989us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 8,263us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased      
Stock Issuance and Stock Repurchase Program (Textual) [Abstract]                
Stock Issued During Period, Shares, New Issues 7,200us-gaap_StockIssuedDuringPeriodSharesNewIssues              
Common Stock, Par or Stated Value Per Share   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare        
Sale of Stock, Price Per Share             $ 32.00us-gaap_SaleOfStockPricePerShare  
Proceeds from Issuance of Common Stock          $ 220,357us-gaap_ProceedsFromIssuanceOfCommonStock      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           20,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased   20,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased