Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	May 31, 2012	Nov. 30, 2011
Assets [Abstract]
Cash and cash equivalents	$ 241,884	$ 161,095
Short-term investments	86,364	100,321
Total cash, cash equivalents and short-term investments	328,248	261,416
Accounts receivable (less allowances of $3,026 in 2012 and $6,683 in 2011)	85,787	110,927
Other current assets	26,060	21,143
Deferred tax assets	10,856	14,291
Total current assets	450,951	407,777
Property and equipment, net	66,444	66,206
Intangible assets, net	53,437	64,408
Goodwill	257,625	257,824	[1]
Deferred tax assets	33,577	30,361	[1]
Investments in auction rate securities	31,448	33,539
Other assets	5,829	5,627
Total assets	899,311	865,742
Liabilities and shareholders' equity [Abstract]
Current portion of long-term debt	71	357
Accounts payable	8,948	7,039
Accrued compensation and related taxes	31,472	31,245
Income taxes payable	1,910	11,412
Other accrued liabilities	41,126	35,728
Short-term deferred revenue	146,882	145,727
Total current liabilities	230,409	231,508
Long-term deferred revenue	5,517	6,619
Deferred tax liabilities	1,508	1,533
Other noncurrent liabilities	2,333	3,782	[1]
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock, $0.01 par value; authorized, 1,000,000 shares; issued, none	0	0
Common stock, $0.01 par value, and additional paid-in capital; authorized, 200,000,000 shares; issued and outstanding, 63,310,870 shares in 2012 and 61,788,629 shares in 2011	342,087	309,221
Retained earnings, including accumulated other comprehensive loss of $14,260 in 2012 and $13,056 in 2011	317,457	313,079
Total shareholders' equity	659,544	622,300
Total liabilities and shareholders' equity	$ 899,311	$ 865,742

[1] The November 30, 2011 balance sheet has been revised to reflect purchase accounting measurement period adjustments (Note 6).