Leases - Lease Maturity Under Topic 840 (Details)	Jul. 31, 2019 USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 11,812,000
Operating Leases, Future Minimum Payments, Due in Two Years	8,723,000
Operating Leases, Future Minimum Payments, Due in Three Years	7,343,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,776,000
Operating Leases, Future Minimum Payments, Due in Five Years	3,430,000
Operating Leases, Future Minimum Payments, Due Thereafter	7,130,000
Operating Leases, Future Minimum Payments Due	44,214,000
Capital Leases, Future Minimum Payments Due, Next Twelve Months	789,000
Capital Leases, Future Minimum Payments Due in Two Years	0
Capital Leases, Future Minimum Payments Due in Three Years	0
Capital Leases, Future Minimum Payments Due in Four Years	0
Capital Leases, Future Minimum Payments Due in Five Years	0
Capital Leases, Future Minimum Payments Due Thereafter	0
Capital Leases, Future Minimum Payments Due	789,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	32,000
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	757,000
Operating And Capital Leases, Future Minimum Payments Due, Next Twelve Months	12,601,000
Operating And Capital Leases, Future Minimum Payments Due In Two Years	8,723,000
Operating And Capital Leases, Future Minimum Payments Due In Three Years	7,343,000
Operating And Capital Leases, Future Minimum Payments Due In Four Years	5,776,000
Operating And Capital Leases, Future Minimum Payments Due In Five Years	3,430,000
Operating And Capital Leases, Future Minimum Payments Due Thereafter	7,130,000
Operating And Capital Leases, Future Minimum Payments Due	45,003,000
Operating Leases, Future Minimum Payments Due And Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	$ 44,971,000