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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Cash flows from operating activities:    
Net income $ 7,489 $ 20,521
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property and equipment 2,336 2,212
Amortization of acquired intangibles and other 6,226 6,249
Stock-based compensation 7,091 4,184
Deferred income taxes 589 (187)
Tax benefit from stock plans 275 3,361
Excess tax benefit from stock plans (705) (2,723)
Allowances for accounts receivable 200   
Changes in operating assets and liabilities:    
Accounts receivable 9,307 17,667
Other assets 103 506
Accounts payable and accrued liabilities (3,195) (22,861)
Income taxes payable and uncertain tax positions (4,382) 3,650
Deferred revenue 13,195 17,651
Net cash flows from operating activities 38,529 50,230
Cash flows from investing activities:    
Purchases of investments (6,623) (26,285)
Sales and maturities of investments 27,195 3,430
Redemptions at par by issuers of auction rate securities 225 200
Purchases of property and equipment (3,942) (3,352)
(Increase) decrease in other noncurrent assets (350) 65
Net cash flows from investing activities 16,505 (25,942)
Cash flows from financing activities:    
Issuance of common stock 13,973 18,857
Withholding tax payments related to net issuance of restricted stock units (884)  
Repurchase of common stock   (24,977)
Excess tax benefit from stock plans 705 2,723
Payment of long-term debt (183) (86)
Net cash flows from financing activities 13,611 (3,483)
Effect of exchange rate changes on cash 1,955 4,784
Net increase in cash and equivalents 70,600 25,589
Cash and cash equivalents, beginning of period 161,095 286,559
Cash and cash equivalents, end of period 231,695 312,148
Supplemental disclosure:    
Cash paid for income taxes, net of refunds of $127 in 2012 and $3,582 in 2011 $ 7,717 $ 37