Commitments and Contingencies (Details) $ in Thousands	Jul. 31, 2020 USD ($) Property
Loss Contingencies [Abstract]
Provision for non-performance by primary obligor under lease arrangements	$ 344
Standby Letters of Credit [Member] | Revolving Credit Facility [Member]
Loss Contingencies [Abstract]
Letters of credit outstanding	$ 21,528
Lease Performance Guarantee [Member]
Loss Contingencies [Abstract]
Number of properties for which the company is secondarily liable for lease payments | Property	2