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

Exchange ratio used to determine the number of shares of common stock into which they converted.

No definition available.

Name:	chpt_ExchangeRatioUsedToDetermineTheNumberOfSharesOfCommonStockIntoWhichTheyConverted
Namespace Prefix:	chpt_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant