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5. BITCOIN - Schedule of Activities of the Bitcoin (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Common Domain Members [Abstract] |  |
Balance as of September 30, 2023 | $ 56,241 |
Cumulative effect of the adoption of ASC 350-60 | 4,183 |
Adjusted beginning balance - at fair value |  | $ 60,424
Addition of bitcoin from mining activities | 185,585 |
Bitcoin sold & issued for services and purchase of software | (43,771) |
Gains from fair value adjustments | 155,743 |
Balance as of March 31, 2024 | $ 357,981 | $ 56,241

X
- Definition Addition of bitcoin + References No definition available. + Details
Name: | clsk_AdditionOfBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjusted beginning balance fair value of Bitcoin + References No definition available. + Details
Name: | clsk_AdjustedBeginningBalanceFairValueOfBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Bitcoin issued for services + References No definition available. + Details
Name: | clsk_BitcoinIssuedForServices
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Bitcoin's Value + References No definition available. + Details
Name: | clsk_BitcoinsValue
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cumulative effect change in fair value of Bitcoin + References No definition available. + Details
Name: | clsk_CumulativeEffectChangeInFairValueOfBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gains from fair value adjustments of Bitcoin + References No definition available. + Details
Name: | clsk_GainsFromFairValueAdjustmentsOfBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | srt_CommonDomainMembersAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration