Summary Of Significant Accounting Policies (Components Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Accounting Policies [Abstract]
Land	$ 20,029	$ 20,558
Buildings	272,616	273,599
Machinery and equipment	783,136	753,637
Construction in progress	52,350	51,394
Less accumulated depreciation	(657,520)	(647,523)
Property, plant, and equipment, net	$ 470,611	$ 451,665	$ 419,280