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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2021
Aug. 31, 2020
Nov. 30, 2020
Leases [Abstract]          
Lease costs under long-term operating leases $ 1,991 $ 1,714 $ 6,135 $ 5,471  
Lease costs under short-term operating leases 3 235 22 379  
Variable lease cost under short-term and long-term operating leases 130 113 280 301  
Operating lease right-of-use asset impairment 0 0 36 1,189  
Total operating lease cost $ 2,124 $ 2,062 6,473 7,340  
Cash paid for leases     6,440 5,979  
Right-of-use assets recognized for new leases and amendments (non-cash)     $ 3,222 $ 204  
Weighted average remaining lease term in years 4 years 5 months 15 days   4 years 5 months 15 days   5 years 7 days
Weighted average discount rate 2.70%   2.70%   2.30%