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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Carrying amount of goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2020
Oct. 31, 2020
Changes in the carrying amount of goodwill    
Beginning balance   $ 5,847
Changes in goodwill acquired   (972)
Goodwill impairment $ (4,903) (4,903)
Impact of foreign currency translation   28
Ending balance $ 0 $ 0