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Net Income Per Common Share Net Loss per Common Share (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 0 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Jul. 10, 2015
Jun. 25, 2015
Jun. 05, 2015
Anti-dilutive securities (in shares) 15,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 4,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 11,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount      
Cash dividends declared per share $ 0.6225us-gaap_CommonStockDividendsPerShareDeclared $ 0.4150us-gaap_CommonStockDividendsPerShareDeclared $ 1.4525us-gaap_CommonStockDividendsPerShareDeclared $ 0.8300us-gaap_CommonStockDividendsPerShareDeclared      
Payments of Dividends $ 22,634us-gaap_PaymentsOfDividends $ 15,000us-gaap_PaymentsOfDividends $ 52,778us-gaap_PaymentsOfDividends $ 29,998us-gaap_PaymentsOfDividends      
Scenario, Forecast [Member]              
Cash dividends declared per share             $ 0.6225us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Dividends Payable, Date to be Paid         Jul. 10, 2015    
Dividends Payable, Date of Record           Jun. 25, 2015