Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 31, 2017	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)		$ 28,170	$ 20,446	$ 21,155
Decrease in valuation allowance		1,700	5,000	1,500
Cumulative undistributed foreign earnings		13,800
Unrecognized tax benefits		7,520	7,046	$ 4,779	$ 1,711
Deferred tax assets related to operating loss carryforwards, not recorded		3,000
Interest and penalties recorded to provision for income taxes		200
Accrued estimated interest and penalties		500	$ 300
Federal and Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		115,700
Indefinite-Lived Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		800
Tax credit carryforwards		2,300
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		11,700
Tax credit carryforwards		3,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards		800
Other Noncurrent Liabilities [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits		$ 4,500
Out of Period Tax Adjustment [Member]
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ (2,700)