CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Investing Activities:
Acquisitions, net of disposals	$ 13	$ 13

This element represents acquisition of property and equipment, net of disposals.

No definition available.

Name:	janl_PaymentsToAcquirePropertyPlantAndEquipmentNetOfDisposals
Namespace Prefix:	janl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration