Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended			12 Months Ended
	May 31, 2019	May 31, 2018	[1]	May 31, 2019	May 31, 2018	[1]	Nov. 30, 2017	Nov. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 2,777	$ 426		$ 3,192	$ 2,247
Restructuring reserve	2,651			2,651				$ 311
2019 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				2,702
Restructuring reserve								0
2019 Restructuring Activities | Other accrued liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2,258			2,258
2017 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	100			490
Restructuring reserve								$ 311
Global workforce reduction (as a percent) (over)							20.00%
2017 Restructuring Activities | Other accrued liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 393			$ 393

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.