Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	[1]	Aug. 31, 2019	Aug. 31, 2018	[1]	Nov. 30, 2017	Nov. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 801	$ 135		$ 3,993	$ 2,382
Restructuring reserve	2,063			2,063				$ 311
2019 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	600			3,313
Restructuring reserve	1,710			1,710				0
2019 Restructuring Activities | Other Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,700			1,700
2017 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	200			680
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	$ 353			$ 353

[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.