Warrants (Details) - Common Stock Warrants [Member] - $ / shares	6 Months Ended	12 Months Ended
Sep. 30, 2020	Mar. 31, 2020
Class of Warrant or Right [Line Items]
Stock price	$ 0.97	$ 1.77
Exercise price	$ 3.10	$ 3.10
Annual dividend yield
Expected term (years)	3 months 19 days	9 months 22 days
Risk-free interest rate	0.10%	0.71%
Expected volatility	158.08%	62.08%

Agreed upon price for the exchange of the underlying asset.

No definition available.

Name:	cjjd_FairValueAssumptionExercisePrice
Namespace Prefix:	cjjd_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

No definition available.

+ Details

Name:	cjjd_FairValueAssumptionExpectedDividendRate
Namespace Prefix:	cjjd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	cjjd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

No definition available.

+ Details

Name:	cjjd_FairValueAssumptionExpectedVolatilityRate
Namespace Prefix:	cjjd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

No definition available.

+ Details

Name:	cjjd_FairValueAssumptionRiskFreeInterestRate
Namespace Prefix:	cjjd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
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Period Type: