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Stockholders' Equity (Dividends) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended
Feb. 09, 2015
Jan. 31, 2015
Apr. 30, 2015
Apr. 30, 2014
Equity [Abstract]        
Dividends on common stock $ 1,400us-gaap_PaymentsOfDividendsCommonStock   $ 1,448us-gaap_PaymentsOfDividendsCommonStock $ 1,436us-gaap_PaymentsOfDividendsCommonStock
Cash dividend, per share $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid      
Dividends payable, date of record   Jan. 23, 2015