Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Cash flows from operating activities:
Net income	$ 20,988	$ 18,067
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	5,794	6,480
Amortization of intangibles and other	25,530	23,316
Stock-based compensation	9,559	19,009
Loss on disposal of property	186	364
Asset impairment	0	5,051
Deferred income taxes	3,518	(996)
Excess tax benefit from stock plans	(403)	(305)
Allowances for accounts receivable	53	(334)
Changes in operating assets and liabilities:
Accounts receivable	15,769	11,209
Other assets	3,783	(3,866)
Accounts payable and accrued liabilities	(10,971)	(14,920)
Income taxes payable	759	2,025
Deferred revenue	(1,394)	3,810
Net cash flows from operating activities	73,171	68,910
Cash flows used in investing activities:
Purchases of investments	(30,482)	(33,861)
Sales and maturities of investments	25,904	17,275
Purchases of property and equipment	(865)	(3,747)
Proceeds from sale of property, plant and equipment, net	1,557	0
Payments for acquisitions, net of cash acquired	(77,149)	0
Net cash flows used in investing activities	(81,035)	(20,333)
Cash flows used in financing activities:
Proceeds from stock-based compensation plans	7,245	8,166
Purchases of stock related to withholding taxes from the issuance of restricted stock units	(2,369)	(2,751)
Repurchases of common stock	(43,936)	(71,507)
Excess tax benefit from stock plans	403	305
Dividend payments to shareholders	(18,151)	0
Payment of long-term debt	(11,250)	(7,500)
Net cash flows used in financing activities	(68,058)	(73,287)
Effect of exchange rate changes on cash	13,643	415
Net decrease in cash and cash equivalents	(62,279)	(24,295)
Cash and cash equivalents, beginning of period	207,036	212,379
Cash and cash equivalents, end of period	144,757	188,084
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $3,584 in 2017 and $781 in 2016	10,469	11,918
Cash paid for interest	2,703	2,348
Non-cash investing and financing activities:
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested	13,833	12,137
Dividends declared	$ 5,975	$ 0