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Restricted Cash (Details Textual)	9 Months Ended
	Jun. 30, 2012
Restricted Cash (Textual) [Abstract]
First year of product warranty	First year of product warranty
Extended warranty and maintenance the noncurrent portion	7 years
Current portion will become unrestricted upon completion of the warranty term	1 year
Noncurrent portion extended warranty term	7 years

X

- Definition

Current portion will become unrestricted upon completion of the warranty term.

+ References

No definition available.

+ Details

Name:	lrad_CurrentPortionWillBecomeUnrestrictedUponCompletionOfWarrantyTerm
Namespace Prefix:	lrad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Extended product warranty included in restricted cash noncurrent renewed annually.

+ References

No definition available.

+ Details

Name:	lrad_ExtendedProductWarrantyIncludedInRestrictedCashNonCurrentRenewedAnnually
Namespace Prefix:	lrad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Non current portion will become unrestricted upon completion of extended warranty term.

+ References

No definition available.

+ Details

Name:	lrad_NonCurrentPortionWillBecomeUnrestrictedUponCompletionOfExtendedWarrantyTerm
Namespace Prefix:	lrad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted cash current covering warranty.

+ References

No definition available.

+ Details

Name:	lrad_RestrictedCashCurrentCoveringWarranty
Namespace Prefix:	lrad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	lrad_RestrictedCashTextualAbstract
Namespace Prefix:	lrad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration