Income Taxes (Reconciliation Of The U.S. Federal Statutory Rate To The Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Income Tax Disclosure [Abstract]
Tax at U.S. Federal statutory rate	$ (12,348)	$ 4,324	$ 27,231
Foreign rate differences	7,689	16,945	1,320
Effects of foreign operations included in U.S. Federal provision	(1,244)	(996)	(1,821)
State income taxes, net	2,977	1,029	1,227
Research credits	(838)	(681)	(80)
Domestic production activities deduction	(1,925)	(1,750)	(1,095)
Tax-exempt interest	(76)	(51)	(80)
Nondeductible stock-based compensation	740	1,875	2,152
Meals and entertainment	234	321	220
Compensation subject to 162(m)	0	228	350
Uncertain tax positions and tax settlements	(1,701)	(332)	(123)
Prior period adjustment	(2,700)	0	0
Release of valuation allowance on state research and development credits	(2,748)	0	0
Goodwill Impairment	32,200	0	0
Other	186	243	(955)
Total	$ 20,446	$ 21,155	$ 28,346