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Dividends and Treasury Stock (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Stockholders' Equity Note [Abstract]    
Dividends paid $ 4,940us-gaap_PaymentsOfDividendsCommonStock $ 4,371us-gaap_PaymentsOfDividendsCommonStock
Cash dividends paid per common share (in dollars per share) $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid $ 0.12us-gaap_CommonStockDividendsPerShareCashPaid
Stock Repurchase Program, Authorized Amount 40,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 36,956us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1