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Investments And Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended					12 Months Ended
	Jul. 31, 2011 Auction Period One [Member] days	Jul. 31, 2011 Auction Period Two [Member] days	Jul. 31, 2011 Auction Period Three [Member] days	Jul. 31, 2011 Level 1 [Member]	Jul. 31, 2010 Level 1 [Member]	Jul. 31, 2011 Auction Rate Securities [Member] years
Non-qualified retirement plan assets				$ 8,715	$ 7,499
Long-term investments, par value						$ 2,150
Sale period						2
Sale value of securities at par						3,700
Dutch Auction Days	7	28	35
Temporary impairments						108
Temporary impairments, net of tax in other comprehensive income						$ 67

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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