Leases (Details) - USD ($) $ in Thousands	3 Months Ended
Nov. 02, 2019	Jul. 31, 2019
Significant Assumptions of Operating Leases [Abstract]
Weighted-average remaining lease term	2 years 6 months 22 days
Weighted average discount rate	5.17%
Balance Sheet Classification of Right of Use Assets and Lease Liabilities [Abstract]
Right of use assets (included in non-current assets)	$ 5,771	$ 0
Lease Liabilities [Abstract]
Current	1,754	0
Non-current	4,041	$ 0
Total lease liabilities	5,795
Operating lease expense	600
Maturities of Operating Lease Liabilities [Abstract]
Remainder of fiscal year 2020	1,610
2021	1,880
2022	1,384
2023	928
2024	453
Thereafter	59
Total undiscounted lease payments	6,314
Less: imputed interest	(519)
Present value of lease liabilities	$ 5,795
Minimum [Member]
Nature of Leases [Abstract]
Lease term	1 year
Maximum [Member]
Nature of Leases [Abstract]
Lease term	6 years

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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