Income Taxes (Reconciliation Of The U.S. Federal Statutory Rate To The Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Income Tax Disclosure [Abstract]
Tax at U.S. Federal statutory rate	$ 22,955	$ (12,348)	$ 4,324
Foreign rate differences	4,575	7,689	16,945
Effects of foreign operations included in U.S. Federal provision	(186)	(1,244)	(996)
State income taxes, net	1,702	2,977	1,029
Research credits	(251)	(838)	(681)
Domestic production activities deduction	(2,670)	(1,925)	(1,750)
Tax-exempt interest	(101)	(76)	(51)
Nondeductible stock-based compensation	808	740	1,875
Meals and entertainment	276	234	321
Compensation subject to 162(m)	208	0	228
Uncertain tax positions and tax settlements	429	(1,701)	(332)
Prior period adjustment	0	(2,700)	0
Release of valuation allowance on state research and development credits	0	(2,748)	0
Goodwill Impairment	0	32,200	0
Other	425	186	243
Total	$ 28,170	$ 20,446	$ 21,155

Effective Income Tax Rate Reconciliation, Foreign Earnings Included In Domestic Provision, Amount

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Effective Income Tax Rate Reconciliation, Nondeductible Expense, Compensation Expense, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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