Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 5,868	$ 5,729
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,200,000	1,200,000
Common stock, shares issued	166,287	164,522
Common stock, shares outstanding	166,287	164,522