Employee Benefit Plans (Details Textual) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Employee Benefit Plans (Textuals) [Abstract]
Amount paid to participants in settlement		$ 455
Reduction of liability due to one-time plan amendment		169
Other separation benefits		1,178	1,178
Estimated actuarial gain to be amortized from accumulated other comprehensive income into net periodic postretirement benefit cost over the next fiscal year	178
Estimated prior service credit to be amortized from accumulated other comprehensive income into net periodic postretirement benefit cost over the next fiscal year	82
Curtailment gain due to reduction in workforce		679
Unrecognized prior service cost		106
Curtailment loss			393
Accrued profit-sharing included in other current liabilities and other long-term liabilities	7,293	7,540
Deferred compensation included in current and other long term liabilities	12,299	10,398
Expense for the retirement and profit sharing	$ 14,552	$ 12,547	$ 11,765