Subsequent Events (Details) (USD $)	Nov. 18, 2011	Oct. 31, 2011	Jul. 31, 2011
Subsequent Events [Abstract]
Common stock, share par value	$ 5.00	$ 5	$ 5
Common stock, shares authorized	240,000,000	120,000,000	120,000,000
Total number of shares authorized	241,000,000	121,000,000