Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Feb. 28, 2012	Nov. 30, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 4,870	$ 5,868
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,200,000	1,200,000
Common stock, shares issued	164,828	166,287
Common stock, shares outstanding	164,828	166,287