Goodwill and intangible assets (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Oct. 31, 2020 |
Jul. 31, 2020 |
Oct. 31, 2019 |
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| Goodwill and Intangible Assets Disclosure [Abstract] | |||
| Goodwill | $ 7,452 | $ 7,452 | $ 7,452 |
| Weighted average remaining useful life | 2 years |
| X | ||||||||||
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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