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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
May 31, 2016
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2015
Operating Loss Carryforwards [Line Items]          
Income tax expense (benefit)   $ 15,489 $ 28,170 $ 20,446  
Income tax benefit due to the re-measurement of its net U.S. deferred tax liabilities due to the Act   1,660 0 0  
Decrease in valuation allowance   7,300 1,700 5,000  
Cumulative undistributed foreign earnings   92,200      
Unrecognized tax benefits   5,787 7,520 $ 7,046 $ 4,779
Deferred tax assets related to operating loss carryforwards, not recorded   2,200      
Income tax benefit recorded to as a result of interest and penalties   100      
Interest and penalties recorded to provision for income taxes   200 200    
Reduction related to statue of expiration due to interest and penalties   300      
Accrued estimated interest and penalties   400 $ 500    
Federal and Foreign          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards   146,500      
Indefinite-Lived Carryforwards          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards   100      
Tax credit carryforwards   2,300      
State          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards   4,800      
Tax credit carryforwards   2,900      
Federal          
Operating Loss Carryforwards [Line Items]          
Tax credit carryforwards   900      
Other Noncurrent Liabilities          
Operating Loss Carryforwards [Line Items]          
Unrecognized tax benefits   $ 3,600      
Out of Period Tax Adjustment          
Operating Loss Carryforwards [Line Items]          
Income tax expense (benefit) $ (2,700)       $ 2,700