Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Nov. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 695	$ 2,777	$ 1,735	$ 3,192
Restructuring reserve	1,431		1,431		$ 2,203
Operating lease, impairment loss	300		1,200
2019 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	100		109
Restructuring reserve	435		435		1,460
2019 Restructuring Activities | Other Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	400		400
2017 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	300		1,373
Restructuring reserve					$ 552
2017 Restructuring Activities | Other Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 894		$ 894