Leases - Supplemental balance sheet (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Aug. 01, 2019	Jul. 31, 2019
Assets:
Right of use assets	$ 44,267	$ 35,842
Finance lease assets	4,417
Right-of-use assets, net	48,684		$ 0
Liabilities:
Operating lease liabilities	9,852
Finance lease liabilities	416
Current portion of lease liabilities	10,268		0
Operating lease liabilities	36,515
Finance lease liabilities	4,164
Long-term lease liabilities	40,679		$ 0
Total lease liabilities	$ 50,947
Weighted average remaining lease term:
Operating leases	6 years 1 month 9 days
Finance leases	5 years 10 months 9 days
Weighted average discount rate:
Operating leases	2.73%
Finance leases	23.39%