v3.25.4

4. BITCOIN - Company's Bitcoin Holdings (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Sep. 30, 2025
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Common Domain Members [Abstract] |  |
Number Of Bitcoins Held | $ 11,452 | $ 10,428
Cost basis - per bitcoin | 104,390 | 105,025
Fair value - per bitcoin | 87,498 | 114,068
Cost basis of bitcoin (in '000s) | 1,195,444 | 1,095,151
Fair value of bitcoin (in '000s) | $ 1,001,997 | $ 1,189,443

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- Definition Cost basis 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 Cost basis - per bitcoin + References No definition available. + Details
Name: | clsk_CostBasisPerBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of bitcoin + References No definition available. + Details
Name: | clsk_FairValueOfBitcoin
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value - per Bitcoin + References No definition available. + Details
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Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of Bitcoins Held + References No definition available. + Details
Name: | clsk_NumberOfBitcoinsHeld
Namespace Prefix: | clsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
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