BALANCE SHEET INFORMATION - Schedule of Service Parts Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Finished goods	$ 20,435	$ 19,234
Component parts	5,023	5,020
Total service parts inventories	$ 25,458	$ 24,254

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