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INTANGIBLE ASSETS - Estimated Useful Life (Details)	12 Months Ended
	Sep. 30, 2020
Patents [Member] | Patents Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Patents [Member] | Patents Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Websites [Member]
Finite-Lived Intangible Assets [Line Items]
Websites	3 years
Customer List [Member] | Customer List Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
[custom:CustomerListAndNonCompeteUsefulLife]	3 years
Customer List [Member] | Customer List Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
[custom:CustomerListAndNonCompeteUsefulLife]	4 years
Design Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Design assets	2 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Trademarks	14 years
Engineering [Member]
Finite-Lived Intangible Assets [Line Items]
Engineering Trade Secrets	7 years
Software [Member] | Software Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Software	2 years
Software [Member] | Software Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Software	3 years

X

- References

No definition available.

+ Details

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Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	CLSK_EnginerringTradeSecretsUsefulLife
Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	CLSK_SooftwareUsefulLife
Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	CLSK_TrademarksUsefulLife
Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	CLSK_WebsitesUsefulLife
Namespace Prefix:	CLSK_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=CLSK_CustomerListMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=CLSK_CustomerListMinimumMember
Namespace Prefix:
Data Type:	na
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X

- Details

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X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=CLSK_DesignAssetsMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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Namespace Prefix:
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- Details

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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Period Type: