BALANCE SHEET INFORMATION - Schedule of Service Parts Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Finished goods	$ 17,884	$ 19,834
Component parts	7,392	5,470
Total service parts inventories	$ 25,276	$ 25,304

Carrying amount of completed service parts merchandise or goods expected to be sold within one year or operating cycle, if longer.

No definition available.

Name:	qtm_ServicePartsInventoriesFinishedGoods
Namespace Prefix:	qtm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant