Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Nov. 30, 2017 USD ($)	Nov. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)
Cash flows from operating activities:
Net income (loss)	$ 37,417	$ (55,726)	$ (8,801)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property and equipment	7,526	8,506	9,394
Amortization of acquired intangibles and other	35,370	30,815	32,286
Stock-based compensation	14,153	22,541	24,004
Changes in fair value of contingent consideration obligation	0	0	(1,508)
Loss on disposal of property and equipment	416	370	41
Impairment of goodwill and long-lived assets	0	97,051	4,962
Deferred income taxes	474	1,307	(1,845)
Excess tax benefits from stock plans	(904)	(436)	(1,349)
Allowances for bad debt and sales credits	46	(479)	453
Changes in operating assets and liabilities:
Accounts receivable	6,442	647	3,747
Other assets	2,813	(3,925)	5,428
Accounts payable and accrued liabilities	673	(3,094)	(370)
Income taxes payable	892	109	2,481
Deferred revenue	368	5,159	35,617
Net cash flows from operating activities	105,686	102,845	104,540
Cash flows from investing activities:
Purchases of investments	(40,380)	(41,691)	(24,178)
Sales and maturities of investments	31,559	26,475	14,626
Purchases of property and equipment	(3,377)	(5,786)	(7,184)
Capitalized software development costs	0	0	(1,661)
Payments for acquisitions, net of cash acquired	(77,150)	0	(246,275)
Proceeds from sale of property, plant and equipment, net	1,557	0	0
Proceeds from divestitures, net	0	0	4,500
Decrease in other noncurrent assets	0	0	(36)
Net cash flows used in investing activities	(87,791)	(21,002)	(260,208)
Cash flows from financing activities:
Proceeds from stock-based compensation plans	10,025	9,918	13,069
Purchase of common stock related to withholding taxes from issuance of restricted stock units	(3,756)	(3,984)	(5,631)
Repurchases of common stock	(73,936)	(79,188)	(32,868)
Dividend payment to shareholders	(24,127)	0	0
Excess tax benefit from stock plans	904	436	1,349
Proceeds from the issuance of debt	0	0	150,000
Payment of long-term debt	(11,250)	(9,375)	(5,625)
Payment of contingent consideration	(1,174)	0	(1,785)
Payment of contingent consideration	0	0	(209)
Net cash flows (used in) from financing activities	(103,314)	(82,193)	118,300
Effect of exchange rate changes on cash	11,847	(4,993)	(13,335)
Net decrease in cash and equivalents	(73,572)	(5,343)	(50,703)
Cash and equivalents, beginning of year	207,036	212,379	263,082
Cash and equivalents, end of year	133,464	207,036	212,379
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $3,997 in 2017, $1,379 in 2016, and $2,264 in 2015	25,992	22,031	17,036
Cash paid for interest	3,597	3,157	2,725
Non-cash financing activity:
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested	20,089	17,213	18,714
Dividends declared	$ 6,619	$ 6,067	$ 0