Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	May 31, 2013	Nov. 30, 2012
Assets
Allowance for accounts receivable (in dollars)	$ 2,536	$ 3,024
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	54,046,817	59,594,961
Common stock, shares outstanding	54,046,817	59,594,961
Accumulated other comprehensive losses (in dollars)	$ (13,139)	$ (10,764)