Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 7,040	$ 6,418
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 5.00	$ 5.00
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	151,643,194	151,643,194
Treasury stock, shares	5,490,725	3,980,832