Quantum Corporation Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

DEBT - Narrative (Details)

DEBT - Narrative (Details)								3 Months Ended	12 Months Ended
DEBT - Narrative (Details)	Mar. 31, 2026 USD ($)	Dec. 18, 2025 USD ($)	Sep. 23, 2025 USD ($) day $ / shares shares	Apr. 02, 2025 USD ($)	Aug. 31, 2024 USD ($) $ / shares shares	Aug. 14, 2024	Jun. 01, 2023 USD ($) $ / shares shares	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Aug. 13, 2025 USD ($)	May 05, 2025 USD ($)	Aug. 13, 2024 USD ($)	Jul. 31, 2024 USD ($)	Jul. 11, 2024 $ / shares shares	Aug. 05, 2021 USD ($)
Debt Instrument
Borrowings of long-term debt, net of debt issuance costs									$ 45,045,000	$ 25,000,000
Borrowings of credit facility									102,914,000	416,418,000
Paid-in-kind interest									6,598,000	5,179,000
Gain (loss) on extinguishment of debt									$ (59,641,000)	$ (3,003,000)
Consulting Fees \| Related Party
Debt Instrument
Related party transaction, amounts of transaction	$ 1,100,000
Forbearance Warrant
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares			$ 8.81
July 2024 Warrants
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares															$ 8.20
Warrants callable (in shares) \| shares															50,000
August 2024 Warrants
Debt Instrument
Issuance of warrants					$ 1,200,000
Forbearance Warrant
Debt Instrument
Warrants callable (in shares) \| shares			2,653,308
Class of warrant or right, common stock outstanding percentage									19.90%
Line of Credit
Debt Instrument
Debt extinguishment cost											$ 1,200,000
Convertible Note
Debt Instrument
Stated interest rate (as a percent)			10.00%
Debt extinguished		$ 54,700,000
Lender fees		$ 2,200,000
Long-term debt, term			3 years
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares			$ 10.00
Debt instrument, convertible, minimum reset price (in dollars per share) \| $ / shares			$ 4.00
Debt instrument, convertible, if-called conversion price percentage			80.00%
Debt instrument, convertible, threshold trading days \| day			20
Convertible Note \| Debt Instrument, Redemption, Period One
Debt Instrument
Debt instrument, convertible, mandatory exchange rate			20.00%
Convertible Note \| Debt Instrument, Redemption, Period Two
Debt Instrument
Debt instrument, convertible, mandatory exchange rate			20.00%
Convertible Note \| Debt Instrument, Redemption, Period Three
Debt Instrument
Debt instrument, convertible, mandatory exchange rate			30.00%
Term Loan
Debt Instrument
Gain (loss) on extinguishment of debt								$ (31,000,000.0)
Term Loan \| Secured Debt
Debt Instrument
Line of credit facility, maximum borrowing amount					$ 26,300,000
Borrowings of long-term debt, net of debt issuance costs							$ 15,000,000.0
Debt issuance cost				$ 400,000			$ 900,000					$ 100,000
Stated interest rate (as a percent)					5.00%		9.00%
Warrants issued (in shares) \| shares					380,310
Warrant exercise price (in dollars per share) \| $ / shares					$ 6.20
Line of credit facility, maximum borrowing amount, net					$ 25,000,000.0
Borrowings of credit facility					10,500,000
Line of credit facility, remaining borrowing amount					15,800,000
Gain (loss) on extinguishment of debt				2,400,000	$ (3,000,000.0)
Debt extinguished				$ 51,400,000
Term Loan \| Secured Debt \| Covenant Period One
Debt Instrument
Stated interest rate (as a percent)					11.00%
Paid-in-kind interest rate margin (as a percent)					6.00%
Term Loan \| Secured Debt \| Covenant Period Two
Debt Instrument
Stated interest rate (as a percent)					13.00%
Paid-in-kind interest rate margin (as a percent)					8.00%
Term Loan \| Secured Debt \| Term Loan Warrant
Debt Instrument
Warrants issued (in shares) \| shares							62,500
Term Loan \| Secured Debt \| July 2024 Warrants
Debt Instrument
Warrants not settleable in cash, fair value disclosure														$ 400,000
Term Loan \| Secured Debt \| August 2024 Warrants
Debt Instrument
Warrants not settleable in cash, fair value disclosure					$ 2,000,000.0
Term Loan \| Secured Debt \| SOFR
Debt Instrument
Variable rate (as a percent)							10.00%
Term Loan \| Secured Debt \| SOFR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)					12.00%
Term Loan \| Secured Debt \| SOFR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)					14.00%
Term Loan \| Term Loan \| Term Loan Warrant
Debt Instrument
Warrant exercise price (in dollars per share) \| $ / shares							$ 20.00
2021 Term Loan \| Secured Debt \| Covenant Period One
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%
2021 Term Loan \| Secured Debt \| Covenant Period Two
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%
2021 Term Loan \| Secured Debt \| Covenant Period Two \| Paid in Kind Threshold One
Debt Instrument
Debt instrument, net leverage ratio						4.00
2021 Term Loan \| Secured Debt \| Covenant Period Two \| Paid in Kind Threshold Two
Debt Instrument
Debt instrument, net leverage ratio						3.50
2021 Term Loan \| Secured Debt \| SOFR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)						1.00%
2021 Term Loan \| Secured Debt \| SOFR \| Covenant Period Two \| Minimum
Debt Instrument
Variable rate (as a percent)						2.00%
2021 Term Loan \| Secured Debt \| ABR \| Covenant Period One
Debt Instrument
Variable rate (as a percent)						1.75%
2021 Term Loan \| Secured Debt \| ABR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)						8.75%
2021 Term Loan \| Secured Debt \| Federal Funds Rate \| Covenant Period One
Debt Instrument
Variable rate (as a percent)						0.50%
2021 Term Loan \| Secured Debt \| Prime Rate \| Covenant Period One
Debt Instrument
Variable rate (as a percent)						8.75%
Initial Term Loan \| Secured Debt \| August 2024 Warrants
Debt Instrument
Paid-in-kind interest					$ 500,000
Amended PNC Credit Facility
Debt Instrument
Debt covenant, proceeds retainable on settlement of debt			$ 15,000,000.0
Debt covenant, potential interest rate increase (percent)			2.00%
Dialectic \| Term Loan
Debt Instrument
Gain (loss) on extinguishment of debt								$ (28,900,000)
Line of Credit \| PNC Credit Facility
Debt Instrument
Line of credit facility, maximum borrowing amount																$ 40,000,000.0
Debt issuance cost														$ 100,000
Line of Credit \| PNC Credit Facility \| Covenant Period One
Debt Instrument
Applicable margin rate, percent (as a percent)						4.75%
Line of Credit \| PNC Credit Facility \| Covenant Period Two
Debt Instrument
Applicable margin rate, percent (as a percent)						3.75%
Line of Credit \| PNC Credit Facility \| SOFR \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)						1.00%
Line of Credit \| PNC Credit Facility \| Overnight Banking Fund Rate \| Covenant Period Two
Debt Instrument
Variable rate (as a percent)						0.50%
Amended PNC Credit Facility
Debt Instrument
Line of credit facility daily minimum liquidity													$ 10,000,000