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, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 08, 2014 Scenario, Forecast [Member]	Jun. 23, 2014 Scenario, Forecast [Member]	Jun. 03, 2014 Scenario, Forecast [Member]
Anti-dilutive securities (in shares)	4,000	25,000	11,000	10,000
Cash dividends declared per share	$ 0.4150	$ 0.2075	$ 0.8300	$ 0.5825			$ 0.4150
Dividends Payable, Date to be Paid					Jul. 08, 2014
Payments of Dividends	$ 15,012	$ 7,500	$ 29,998	$ 20,905
Dividends Payable, Date of Record						Jun. 23, 2014