Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Nov. 30, 2020
Leases [Abstract]
Lease costs under long-term operating leases	$ 2,135	$ 1,958
Lease costs under short-term operating leases	15	45
Variable lease cost under short-term and long-term operating leases	115	106
Operating lease right-of-use asset impairment	0	923
Total operating lease cost	2,265	3,032
Cash paid for leases	2,258	2,356
Right-of-use assets recognized for new leases and amendments (non-cash)	$ 2,338	$ 0
Weighted average remaining lease term in years	4 years 10 months 13 days		5 years 7 days
Weighted average discount rate	2.70%		2.30%