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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Cash flows from operating activities:    
Net income $ 11,100 $ 31,118
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization of property and equipment 2,410 2,418
Amortization of acquired intangibles and other 1,064 983
Stock-based compensation 5,545 4,906
Loss on disposal of property 14 0
Gain on dispositions 0 (35,106)
Asset impairment 0 111
Deferred income taxes (1,508) (1,899)
Tax benefit (deficiency) from stock plans 69 (481)
Excess tax benefit from stock plans (152) (508)
Allowances for accounts receivable 86 (150)
Changes in operating assets and liabilities:    
Accounts receivable 8,027 12,622
Other assets 2,303 (4,833)
Accounts payable and accrued liabilities (13,412) (22,867)
Income taxes payable and uncertain tax positions 639 (21,627)
Deferred revenue 9,239 10,254
Net cash flows from (used in) operating activities 25,424 (25,059)
Cash flows from investing activities:    
Purchases of investments (1,900) 0
Sales and maturities of investments 5,600 10,860
Redemptions and sales of auction rate securities 0 25
Purchases of property and equipment (5,697) (898)
Capitalized software development costs (821) 0
Proceeds from divestitures, net 3,300 73,381
Increase in other noncurrent assets (108) (53)
Net cash flows from investing activities 374 83,315
Cash flows from financing activities:    
Proceeds from stock-based compensation plans 3,890 29,233
Purchases of common stock related to withholding taxes from the issuance of restricted stock units (5) (431)
Repurchases of common stock (9,789) (109,302)
Excess tax benefit from stock plans 152 508
Net cash flows used in financing activities (5,752) (79,992)
Effect of exchange rate changes on cash 492 (839)
Net increase (decrease) in cash and cash equivalents 20,538 (22,575)
Cash and cash equivalents, beginning of period 198,818 301,792
Cash and cash equivalents, end of period 219,356 279,217
Supplemental disclosure:    
Cash paid for income taxes, net of refunds of $53 in 2014 and $126 in 2013 2,581 47,290
Non-cash financing activities:    
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested 1,152 2,576
Unsettled repurchases of common stock $ 0 $ 4,041