Summary Of Significant Accounting Policies (Components Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Land	$ 21,062	$ 22,578
Buildings	258,082	266,482
Machinery and equipment	643,199	625,439
Construction in progress	27,276	31,375
Less accumulated depreciation	(564,710)	(554,372)
Property, plant and equipment, net	$ 384,909	$ 391,502	$ 365,892