Inventories (Components Of Inventory) (Details) (USD $)	Oct. 31, 2011	Jul. 31, 2011
Inventories [Abstract]
Materials	$ 112,443,000	$ 110,466,000
Work in process	36,904,000	33,917,000
Finished products	124,825,000	127,093,000
Total inventories	274,172,000	271,476,000
Obsolete inventory reserves	$ 15,900,000	$ 14,500,000