SUMMARY OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES, Inventory (Details)	12 Months Ended
Sep. 30, 2021
Inventory [Abstract]
Forecast period	3 years

The forecast period for acquired antibody inventory, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	janl_InventoryManufacturedAntibodyForecastPeriod
Namespace Prefix:	janl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration