GENERAL (Details) (USD $)	1 Months Ended
	Dec. 05, 2010	Jul. 31, 2011		Feb. 01, 2011	Oct. 31, 2010
Preferred stock, number of shares authorized, after stock split (in shares)		160,000,000	[1]	160,000,000	160,000,000	[1]
Common stock, non-voting
Common stock, par value, after stock split (in dollars per share)		$ 0.01	[1]		$ 0.01	[1]
Common stock, number of shares authorized, after stock split (in shares)		400,000,000	[1]	400,000,000	400,000,000	[1]
Common Stock
Authorized stock split ratio	2
Common stock, par value, before stock split (in dollars per share)				$ 0.0586
Common stock, par value, after stock split (in dollars per share)		$ 0.0293	[1]	$ 0.0293	$ 0.0293	[1]
Common stock, number of shares authorized, before stock split (in shares)				400,000,000
Common stock, number of shares authorized, after stock split (in shares)		800,000,000	[1]	800,000,000	800,000,000	[1]

[1] Shares and par values have been restated, as appropriate, to reflect the two-for-one stock split effected February 1, 2011.