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EMPLOYEE BENEFIT PLANS, KOSS EMPLOYEE STOCK OWNERSHIP TRUST (KESOT) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Koss Employee Stock Ownership Trust (KESOT), cash contributions	$ 0	$ 0

X

- References

No definition available.

+ Details

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

X

- Definition

This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration