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4. BITCOIN - Schedule of Activities of the Bitcoin (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Common Domain Members [Abstract] |  |  |  |  |
Beginning Balance - before cumulative effect change |  | $ 929,078 | $ 126,951 | $ 431,661 | $ 56,241
Cumulative effect of the adoption of ASC 350-60 |  | 0 | 0 | 0 | 4,183
Adjusted beginning balance after cumulative effect change |  | 929,078 | 126,951 | 431,661 | 60,424
Addition of bitcoin from mining activities | [1] | 181,712 | 111,799 | 344,018 | 185,585
Bitcoin sold & issued for services and purchase of software |  | (3,488) | (471) | (6,903) | (43,771)
Bitcoin transferred to collateral account |  | 0 | 0 | (8,860) | 0
Bitcoin received from collateral account |  | 0 | 0 | 129,180 | 0
(Loss) gain on fair value of bitcoin |  | (127,667) | 119,702 | 90,539 | 155,743
Ending Balance | [2] | $ 979,635 | $ 357,981 | $ 979,635 | $ 357,981
[1] | Net of mining pool fees.
[2] | Includes Bitcoin - current of $832,690 and Bitcoin - noncurrent of $146,945 as presented within condensed consolidated balance sheets as of March 31, 2025.

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- 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

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- 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

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- 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

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- Definition Bitcoin received from collateral account + References No definition available. + Details
Name: | clsk_BitcoinReceivedFromCollateralAccount
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bitcoin Transferred To From Collateral + References No definition available. + Details
Name: | clsk_BitcoinTransferredToFromCollateral
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- 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

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