Leases - Lease Cost and Additional Information (Details)	3 Months Ended
	Oct. 31, 2019 USD ($)
Leases [Abstract]
Amortization of ROU assets	$ 108,000
Interest on lease liabilities	2,000
Operating lease expense	2,637,000
Short-term lease expense	863,000
Variable lease expense	993,000
Sublease income	0
Total lease expense	4,603,000
Operating leases - Operating cash outflows	2,843,000
Finance leases - Operating cash outflows	2,000
Finance leases - Financing cash outflows	198,000
ROU assets obtained in the exchange for lease liabilities - operating leases	$ 598,000