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Summary of Significant Accounting Policies - Property and Equipment, net (Details)	12 Months Ended
	Jan. 31, 2021
Furniture, Fixtures And Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Furniture, Fixtures And Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Computer Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Period Type:

X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=chwy_ComputerEquipmentandSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
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