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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Beginning of Period	$ 44,627	$ 28,756	$ 22,524
Additions Charged to Costs and Expenses	10,299	15,871	6,232
Deductions	0	0	0
End of Period	$ 54,926	$ 44,627	$ 28,756

X

- Definition

Additions Charged to Costs and Expenses

+ References

No definition available.

+ Details

Name:	clsk_AdditionsChargedToCostsAndExpenses
Namespace Prefix:	clsk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deductions

+ References

No definition available.

+ Details

Name:	clsk_Deductions
Namespace Prefix:	clsk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant