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4. BITCOIN - Schedule of Activities of the Bitcoin (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Common Domain Members [Abstract] |  |  |  |  |
Beginning Balance - before cumulative effect change |  | $ 979,635 | $ 357,981 | $ 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 |  | 979,635 | 357,981 | 431,661 | 60,424
Addition of bitcoin from mining activities | [1] | 198,644 | 104,108 | 542,662 | 289,693
Bitcoin purchased |  | 82,152 | 0 | 82,152 | 0
Bitcoin sold |  | (127,829) | 0 | (127,829) | 0
Bitcoin issued for services and other non-cash consideration |  | (81,360) | (718) | (88,263) | (44,490)
Bitcoin transferred to collateral account |  | (282,418) | 0 | (291,278) | 0
Bitcoin received from collateral account |  | 42,279 | 0 | 171,459 | 0
(Loss) gain on fair value of bitcoin |  | 268,651 | (48,338) | 359,190 | 107,406
Ending Balance | [2] | $ 1,079,754 | $ 413,033 | $ 1,079,754 | $ 413,033
[1] | Net of mining pool fees.
[2] | Includes Bitcoin - current of $877,067 and Bitcoin - noncurrent of $202,687 as presented within condensed consolidated balance sheets as of June 30, 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
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Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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 purchased + References No definition available. + Details
Name: | clsk_BitcoinPurchased
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 Sold + References No definition available. + Details
Name: | clsk_BitcoinSold
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