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Share Capital - Authorized capital (Details)	9 Months Ended
	Mar. 31, 2023 CAD ($) shares
Share Capital
Number of common shares issued for exercise of stock options (in shares) | shares	5,750,000
Amount received from exercise of stock options	$ 5,257,000
Amount transferred from contributed surplus to share capital	$ 2,967,430

X

- Definition

Amount transferred from contributed surplus to share capital.

+ References

No definition available.

+ Details

Name:	sli_AmountTransferredFromContributedSurplusToShareCapital
Namespace Prefix:	sli_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The proceeds from the exercise of options, including amount reclassified from reserves to share capital.

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No definition available.

+ Details

Name:	sli_GrossProceedsFromExerciseOfOptionsIncludingReclassificationToShareCapital
Namespace Prefix:	sli_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of common shares issued for exercise of stock options.

+ References

No definition available.

+ Details

Name:	sli_NumberOfCommonSharesIssuedForExerciseOfStockOptions
Namespace Prefix:	sli_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	sli_ShareCapitalAbstract
Namespace Prefix:	sli_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration