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Note 2 - Summary of Significant Accounting Policies - Change in Deferred Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Balance at beginning of year	$ 26,539	$ 21,715
Addition to the deferral	34,581	33,295
Recognition from deferral	(36,524)	(28,471)
Balance at end of year	$ 24,596	$ 26,539

X

- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period.

+ References

No definition available.

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X

- Definition

Amount of revenue recognized of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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+ Details

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Namespace Prefix:	djco_
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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