Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Operating Loss Carryforwards [Line Items]
Income tax benefit due to the re-measurement of its net U.S. deferred tax liabilities due to the Act		$ 1,700
Increase (decrease) in valuation allowance	$ 100	7,300	$ (1,700)
Cumulative undistributed foreign earnings	72,300
Unrecognized tax benefits	4,993	5,787	7,520	$ 7,046
Deferred tax assets related to operating loss carryforwards, not recorded	2,100
Income tax benefit recorded to as a result of interest and penalties	100	100
Interest and penalties recorded to provision for income taxes	100	200	$ 200
Reduction related to statue of expiration due to interest and penalties	200	300
Accrued estimated interest and penalties	400	$ 400
Federal and Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	133,700
Indefinite-Lived Carryforwards
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	2,300
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	900
Tax credit carryforwards	3,200
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	900
Other Noncurrent Liabilities
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 2,900