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Leases (Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Leases [Abstract]    
Operating lease cost $ 4,252 $ 4,372
Variable lease cost 1,408 1,366
Sublease income (390) (395)
Net operating lease cost 5,270 5,343
Lease expense for leases with initial term of 12 months or less $ 200 $ 300