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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	0 Months Ended					3 Months Ended		9 Months Ended
	Jul. 09, 2013	Jun. 24, 2013	Mar. 04, 2013	Mar. 06, 2012	Jun. 08, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Anti-dilutive securities (in shares)						0	0	10,000	24,000
Estimated annual dividend amount (in dollars per share)			$ 0.83	$ 0.75	$ 0.60
Increase to annual cash dividend rate			10.00%	25.00%
Cash dividends declared per share			$ 0.2075			$ 0.2075	$ 0.1875	$ 0.5825	$ 0.4875
Dividends Payable, Date to be Paid	Jul. 09, 2013
Payments of Dividends						$ (7,500)	$ (6,800)	$ 20,905	$ 17,559
Dividends Payable, Date of Record		Jun. 24, 2013

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Aggregate dividends declared during the period for each share of common stock outstanding.

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