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DEBT - Narrative (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2024 | Aug. 14, 2024 | May 24, 2024 | Feb. 14, 2024 | Jun. 01, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Aug. 13, 2024 | Jul. 31, 2024 | Jul. 11, 2024 | May 31, 2024 | Mar. 31, 2024 | Aug. 05, 2021
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings of long-term debt, net of debt issuance costs |  |  |  |  |  |  |  |  | $ 25,000,000 | $ 14,083,000 |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  | 14,092,000 | 4,497,000 |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  | $ 0 |  | $ 0 | 3,003,000 | 0 |  |  |  |  |  |  |
Warrants fair value disclosure |  |  |  |  |  | 34,005,000 |  |  | 34,005,000 |  |  |  |  |  |  | $ 4,046,000 |
Borrowings of credit facility |  |  |  |  |  |  |  |  | 311,135,000 | 318,223,000 |  |  |  |  |  |  |
Paid-in-kind interest |  |  |  |  |  |  |  |  | 3,515,000 | $ 1,401,000 |  |  |  |  |  |  |
Term debt |  |  |  |  |  | $ 98,609,000 |  |  | $ 98,609,000 |  |  |  |  |  |  | 82,496,000 |
2024 Term Loan Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance and sale of warrants |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
July 2024 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  |  |  |  |  | $ 6.20 |  |  | $ 6.20 |  |  |  |  | $ 8.20 |  |  |
Warrants fair value disclosure |  |  |  |  |  | $ 989,000 |  |  | $ 989,000 |  |  |  |  |  |  |  |
Warrants to purchase (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |
August 2024 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  |  |  |  |  | $ 6.20 |  |  | $ 6.20 |  |  |  |  |  |  |  |
Issuance and sale of warrants | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants fair value disclosure |  |  |  |  |  | $ 11,814,000 |  |  | $ 11,814,000 |  |  |  |  |  |  |  |
Amended PNC Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility daily minimum liquidity |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  | $ 15,000,000 |
PNC Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 9.66% |  |  | 9.66% |  |  |  |  |  |  |  |
Fee amount | 700,000 |  |  | $ 200,000 | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing amount |  |  |  |  |  | $ 39,100,000 |  |  | $ 39,100,000 |  |  |  |  |  |  |  |
Line of credit, current borrowing capacity |  |  |  |  |  | $ 1,600,000 |  |  | $ 1,600,000 |  |  |  |  |  |  |  |
PNC Credit Facility | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
Fee amount |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing amount | $ 26,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings of long-term debt, net of debt issuance costs |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 5.00% |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | 380,510 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 6.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt settlement fees |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment fees |  |  | $ 800,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 12,300,000 |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment | $ 3,000,000 |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing amount, net | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings of credit facility | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing amount | 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Debt | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term debt |  |  |  |  |  |  |  |  |  |  | $ 19,600,000 |  |  |  |  |  |
Term Loan | Senior Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Debt | Term Loan Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  | 100,000 |  | 60,000.00 |  |  |  |  |  |  |  |  |  |  |  |
Fee amount |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Senior Secured Debt | July 2024 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |
Term Loan | Senior Secured Debt | August 2024 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants fair value disclosure | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan | Term Loan Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  |  | $ 9.20 |  | $ 20.00 |  |  |  |  |  |  |  |  |  |  |  |
2021 Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 14.59% |  |  | 14.59% |  |  |  |  |  |  |  |
Term Loan Credit Agreement | Senior Secured Debt | August 2024 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-kind interest | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 14.34% |  |  | 14.34% |  |  |  |  |  |  |  |
2024 Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 16.59% |  |  | 16.59% |  |  |  |  |  |  |  |
Domestic Rate and Swing Line Loans | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 11.25% |  |  | 11.25% |  |  |  |  |  |  |  |
Covenant Period One | PNC Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin rate, percent (as a percent) |  | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | PNC Credit Facility | Line of Credit | Minimum | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-kind interest rate margin (as a percent) | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | Term Loan | Senior Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | 2021 Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-kind interest rate margin (as a percent) |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amortization rate (as a percent) |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin rate, percent (as a percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | 2021 Term Loan | Senior Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | 2021 Term Loan | Senior Secured Debt | ABR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | 2021 Term Loan | Senior Secured Debt | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period One | 2021 Term Loan | Senior Secured Debt | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | PNC Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin rate, percent (as a percent) |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | PNC Credit Facility | Line of Credit | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | PNC Credit Facility | Line of Credit | Overnight Banking Fund Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 13.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-kind interest rate margin (as a percent) | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | Term Loan | Senior Secured Debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | 2021 Term Loan | Senior Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid-in-kind interest rate margin (as a percent) |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin rate, percent (as a percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, step-up fee, percent (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | 2021 Term Loan | Senior Secured Debt | Paid in Kind Threshold One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, net leverage ratio |  | 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | 2021 Term Loan | Senior Secured Debt | Paid in Kind Threshold Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, net leverage ratio |  | 3.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | 2021 Term Loan | Senior Secured Debt | ABR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Period Two | 2021 Term Loan | Senior Secured Debt | Minimum | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Applicable Margin Rate, Percent + References No definition available. + Details
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- Definition Debt Instrument, Amendment Fees + References No definition available. + Details
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Namespace Prefix: | qtm_
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Balance Type: | debit
Period Type: | duration

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- Definition Debt Instrument Amortization Rate + References No definition available. + Details
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Namespace Prefix: | qtm_
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Balance Type: | na
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X
- Definition Debt Instrument, Net Leverage Ratio + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
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- Definition Debt Instrument, Paid-In-Kind Interest Rate Margin + References No definition available. + Details
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Namespace Prefix: | qtm_
Data Type: | dtr-types:percentItemType
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- Definition Debt Instrument, Step-up Fee, Percent + References No definition available. + Details
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Namespace Prefix: | qtm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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X
- Definition Debt Settlement Fees + References No definition available. + Details
Name: | qtm_DebtSettlementFees
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line Of Credit Facility Daily Minimum Liquidity Requirement + References No definition available. + Details
Name: | qtm_LineOfCreditFacilityDailyMinimumLiquidityRequirement
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Net + References No definition available. + Details
Name: | qtm_LineOfCreditFacilityMaximumBorrowingCapacityNet
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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