Summary of significant accounting policies - Property and Equipment (Details) |
12 Months Ended |
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Feb. 02, 2019 | |
| Equipment and fixtures | Minimum | |
| Property and equipment | |
| Estimated useful lives or the expected lease term | 3 years |
| Equipment and fixtures | Maximum | |
| Property and equipment | |
| Estimated useful lives or the expected lease term | 10 years |
| Leasehold improvements | |
| Property and equipment | |
| Estimated useful lives or the expected lease term | 10 years |
| Electronic equipment and software | Minimum | |
| Property and equipment | |
| Estimated useful lives or the expected lease term | 3 years |
| Electronic equipment and software | Maximum | |
| Property and equipment | |
| Estimated useful lives or the expected lease term | 5 years |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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