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Basic and Diluted Net Loss Per Share - Additional Information (Detail) | Jul. 31, 2021
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Exchange ratio used to determine the number of shares of common stock into which they converted | 0.9966

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- Definition Exchange ratio used to determine the number of shares of common stock into which they converted. + References No definition available. + Details
Name: | chpt_ExchangeRatioUsedToDetermineTheNumberOfSharesOfCommonStockIntoWhichTheyConverted
Namespace Prefix: | chpt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant